ARM: mstar: Correct the compatible string for pmsleep

The compatible string for the pmsleep region has changed.
Update the MStar/Sigmastar v7 base dtsi with the new string.

Link: https://lore.kernel.org/r/20200729150748.1945589-4-daniel@0x0f.comSigned-off-by: Daniel Palmer <daniel@0x0f.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/mstar-v7.dtsi

@@ -74,7 +74,7 @@ riu: bus@1f000000 {
 			ranges = <0x0 0x1f000000 0x00400000>;
 
 			pmsleep: syscon@1c00 {
-				compatible = "mstar,pmsleep", "syscon";
+				compatible = "mstar,msc313-pmsleep", "syscon";
 				reg = <0x1c00 0x100>;
 			};