ARM: dts: qcom: sdx55: Drop '#clock-cells' from QMP PHY node

'#clock-cells' is a required property of QMP PHY child node, not itself.
Drop it to fix the dtbs_check warnings below.

qcom-sdx55-t55.dt.yaml: phy@ff6000: '#clock-cells' does not match any of the regexes: '^phy@[0-9a-f]+$', 'pinctrl-[0-9]+'
qcom-sdx55-mtp.dt.yaml: phy@ff6000: '#clock-cells' does not match any of the regexes: '^phy@[0-9a-f]+$', 'pinctrl-[0-9]+'
qcom-sdx55-telit-fn980-tlb.dt.yaml: phy@ff6000: '#clock-cells' does not match any of the regexes: '^phy@[0-9a-f]+$', 'pinctrl-[0-9]+'

Signed-off-by: Shawn Guo <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/arm/boot/dts/qcom-sdx55.dtsi

···
 			compatible = "qcom,sdx55-qmp-usb3-uni-phy";
 			reg = <0x00ff6000 0x1c0>;
 			status = "disabled";
-			#clock-cells = <1>;
 			#address-cells = <1>;
 			#size-cells = <1>;
 			ranges;