BACKPORT change to install DT overlays via dtbs_install

[gyenugul]

Overlay binaries (.dtbo) are currently only built implicitly as
dependencies of composite firmware images and are therefore absent from the
kernel install output.

Even when final DTBs are produced at build time, some distributions rely on
standalone DTBOs for runtime selection and application by bootloaders or
firmware. Without explicit install targets, DTBOs are not picked up by the
standard dtbs_install flow and therefore cannot be packaged alongside DTBs.

BACKPORT change to add dtb-$(CONFIG_ARCH_QCOM) entries for all DT overlays defined in
this Makefile so they are installed via dtbs_install, matching existing
DTB install behavior.

CRs-Fixed: 4561683

[qcomlnxci]

Test jobs on 598a56e

• multimedia Job 218029 on hamoa-iot-evk
• multimedia Job 218035 on lemans-evk
• multimedia Job 218028 on monaco-evk
• multimedia Job 218034 on purwa-iot-evk
• multimedia Job 218027 on qcs615-ride
• multimedia Job 218033 on qcs6490-rb3gen2
• multimedia Job 218031 on qcs8300-ride
• multimedia Job 218030 on qcs9100-ride-r3
• multimedia Job on qrb2210-rb1
• multimedia Job 218032 on shikra-iqs-evk

[qcomlnxci]

Test Matrix

Test Case	hamoa-iot-evk-multimedia	lemans-evk-multimedia	monaco-evk-multimedia	purwa-iot-evk-multimedia	qcs615-ride-multimedia	qcs6490-rb3gen2-multimedia	qcs8300-ride-multimedia	qcs9100-ride-r3-multimedia	shikra-iqs-evk-multimedia
Audio_Card_Registration	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	⚠️ skip	⚠️ skip	⚠️ skip
BT_FW_KMD_Service	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
BT_ON_OFF	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
BT_SCAN	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
CPUFreq_Validation	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
CPU_affinity	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
DSP_AudioPD	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	⚠️ skip
Ethernet_Basic_Validation	⚠️ skip	✅ Pass	✅ Pass	⚠️ skip	◻️	⚠️ skip	❌ Fail	❌ Fail	⚠️ skip
Freq_Scaling	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
GIC	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	❌ Fail
IPA	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
Interrupts	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
KVM_Driver	❌ Fail	✅ Pass	✅ Pass	❌ Fail	◻️	❌ Fail	❌ Fail	❌ Fail	❌ Fail
KVM_EL2_DTB	❌ Fail	✅ Pass	✅ Pass	❌ Fail	◻️	❌ Fail	❌ Fail	❌ Fail	❌ Fail
KVM_Infra	❌ Fail	✅ Pass	✅ Pass	❌ Fail	◻️	❌ Fail	❌ Fail	❌ Fail	❌ Fail
OpenCV	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
PCIe	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
Probe_Failure_Check	❌ Fail	❌ Fail	❌ Fail	❌ Fail	◻️	❌ Fail	❌ Fail	❌ Fail	❌ Fail
RMNET	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
UFS_Validation	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	⚠️ skip
USBHost	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	❌ Fail	❌ Fail	❌ Fail	❌ Fail
WiFi_Firmware_Driver	✅ Pass	✅ Pass	❌ Fail	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
WiFi_OnOff	✅ Pass	✅ Pass	❌ Fail	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	⚠️ skip
adsp_remoteproc	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	⚠️ skip
cdsp_remoteproc	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
gpdsp_remoteproc	⚠️ skip	✅ Pass	✅ Pass	⚠️ skip	◻️	⚠️ skip	✅ Pass	✅ Pass	⚠️ skip
hotplug	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
irq	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
kaslr	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
pinctrl	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
qcom_hwrng	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️
rngtest	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
shmbridge	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
smmu	❌ Fail	❌ Fail	✅ Pass	❌ Fail	◻️	✅ Pass	✅ Pass	❌ Fail	✅ Pass
watchdog	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass
wpss_remoteproc	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass