ARM: dts: stm32mp1: DT alignment with Linux kernel v5.9-rc4

DT alignment with Linux kernel v5.9-rc4 for the STM32MP15x soc
device tree files and the STMicroelectronics boards device tree files.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/arch/arm/dts/stm32mp151.dtsi b/arch/arm/dts/stm32mp151.dtsi
index 39d9e54..206d3d3 100644
--- a/arch/arm/dts/stm32mp151.dtsi
+++ b/arch/arm/dts/stm32mp151.dtsi
@@ -1153,7 +1153,7 @@
 		};
 
 		pwr_mcu: pwr_mcu@50001014 {
-			compatible = "syscon";
+			compatible = "st,stm32mp151-pwr-mcu", "syscon";
 			reg = <0x50001014 0x4>;
 		};
 
@@ -1372,6 +1372,8 @@
 			dma-names = "tx", "rx";
 			clocks = <&rcc QSPI_K>;
 			resets = <&rcc QSPI_R>;
+			#address-cells = <1>;
+			#size-cells = <0>;
 			status = "disabled";
 		};