arm64: dts: qcom: qcs6490-rb3gen2: fix root node overlay for phy-supply

[ayaan-anwar]

The staging overlay used a bare "/ {" root node block to define the qep_vreg and aqr_vreg fixed regulators. In a DT overlay, a bare "/ {" creates a new root fragment that is not merged into the base tree's root node; as a result the regulator nodes are never instantiated and the tc956x driver cannot resolve the phy-supply phandle, leading to a failed MDIO probe:

tc956x_pci-eth 0001:05:00.1: No PHY found

Replace "/ {" with the overlay-correct "&{/} {" syntax so that the fragment is properly applied as an amendment to the base device-tree root node. This ensures the regulator nodes are present at boot and the PHY powers up correctly.

Mainline PR: qualcomm-linux/kernel-topics#933
CRs-Fixed: 4499524

[qcomlnxci]

Test jobs on 59451a9

• Job 72700 on lemans-evk
• Job 72698 on monaco-evk
• Job 72699 on qcs615-ride
• Job 72701 on qcs6490-rb3gen2
• Job 72696 on qcs8300-ride
• Job 72706 on qcs9100-ride-r3
• Job 72704 on sm8750-mtp
• Job 72703 on x1e80100-crd

[qcomlnxci]

Test Matrix

Test Case	lemans-evk	monaco-evk	qcs615-ride	qcs6490-rb3gen2	qcs8300-ride	qcs9100-ride-r3	sm8750-mtp	x1e80100-crd
BT_FW_KMD_Service	❌ Fail	❌ Fail	◻️	✅ Pass	❌ Fail	✅ Pass	◻️	◻️
BT_ON_OFF	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
BT_SCAN	✅ Pass	❌ Fail	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
CPUFreq_Validation	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
CPU_affinity	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
DSP_AudioPD	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
Ethernet	✅ Pass	✅ Pass	◻️	⚠️ skip	⚠️ skip	⚠️ skip	◻️	◻️
Freq_Scaling	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
GIC	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
IPA	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
Interrupts	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
OpenCV	⚠️ skip	⚠️ skip	◻️	⚠️ skip	⚠️ skip	⚠️ skip	◻️	◻️
PCIe	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
Probe_Failure_Check	❌ Fail	❌ Fail	◻️	❌ Fail	❌ Fail	❌ Fail	◻️	◻️
RMNET	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
UFS_Validation	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
USBHost	✅ Pass	✅ Pass	◻️	❌ Fail	✅ Pass	✅ Pass	◻️	◻️
WiFi_Firmware_Driver	⚠️ skip	⚠️ skip	◻️	⚠️ skip	⚠️ skip	⚠️ skip	◻️	◻️
WiFi_OnOff	✅ Pass	⚠️ skip	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
cdsp_remoteproc	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
hotplug	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
irq	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
kaslr	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
pinctrl	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
qcom_hwrng	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
remoteproc	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
rngtest	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
shmbridge	✅ Pass	✅ Pass	◻️	✅ Pass	❌ Fail	✅ Pass	◻️	◻️
smmu	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
watchdog	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️
wpss_remoteproc	✅ Pass	✅ Pass	◻️	✅ Pass	✅ Pass	✅ Pass	◻️	◻️