ARM: dts: qcom: nexus7: remove vcss supply which never existed

Probably got in by accident, search trough documentation and kernel code
didn't found any occurences.
Signed-off-by: NDavid Heidelberg <david@ixit.cz>
Signed-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211225212000.80459-1-david@ixit.cz

arch/arm/boot/dts/qcom-apq8064-asus-nexus7-flo.dts

@@ -218,7 +218,6 @@
 			vdd-supply = <&pm8921_l8>;
 			vddio-supply = <&pm8921_lvs7>;
 			avdd-supply = <&pm8921_l11>;
-			vcss-supply = <&ext_3p3v>;
 
 			panel@0 {
 				reg = <0>;