arm64: dts: mediatek: mt6331: Fix VCAM IO regulator name

The ldo-vcamio regulator is named "vcam_io", however, the binding
only allows "vcamio" as name: change it to the latter to resolve
a dtbs_check warning.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Author: AngeloGioacchino Del Regno

arch/arm64/boot/dts/mediatek/mt6331.dtsi

@@ -217,7 +217,7 @@
 			};
 
 			mt6331_vcamio_reg: ldo-vcamio {
-				regulator-name = "vcam_io";
+				regulator-name = "vcamio";
 				regulator-min-microvolt = <1200000>;
 				regulator-max-microvolt = <1800000>;
 				regulator-ramp-delay = <0>;