ARM: dts: imx7s-warp: remove unnecessary cpu regulator supply

i.MX7S does NOT support CPU frequency scaling, so no
need to specify the CPU regulator supply.
Signed-off-by: NAnson Huang <Anson.Huang@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7s-warp.dts

@@ -113,10 +113,6 @@
 	assigned-clock-rates = <884736000>;
 };
 
-&cpu0 {
-	arm-supply = <&sw1a_reg>;
-};
-
 &i2c1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_i2c1>;