ARM: dts: imx6sl: vddpu is NOT an always-on regulator

Remove "regulator-always-on" property for vddpu regulator
since it can be OFF when GPU power domain is OFF.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6sl.dtsi

@@ -588,7 +588,6 @@ reg_pu: regulator-vddpu {
 					regulator-name = "vddpu";
 					regulator-min-microvolt = <725000>;
 					regulator-max-microvolt = <1450000>;
-					regulator-always-on;
 					anatop-reg-offset = <0x140>;
 					anatop-vol-bit-shift = <9>;
 					anatop-vol-bit-width = <5>;