dts: bindings: add back missing pl011 for apollo4p

This commit adds back missing pl011 for apollo4p and
fixed compiling errors.

Signed-off-by: Hao Luo <hluo@ambiq.com>

Author: AlessandroLuo

dts/arm/ambiq/ambiq_apollo4p.dtsi

@@ -109,7 +109,7 @@
 		};
 
 		uart0: uart@4001c000 {
-			compatible = "ambiq,pl011-uart";
+			compatible = "ambiq,pl011-uart", "arm,pl011";
 			reg = <0x4001c000 0x1000>;
 			interrupts = <15 0>;
 			interrupt-names = "UART0";
@@ -118,7 +118,7 @@
 		};
 
 		uart1: uart@4001d000 {
-			compatible = "ambiq,pl011-uart";
+			compatible = "ambiq,pl011-uart", "arm,pl011";
 			reg = <0x4001d000 0x1000>;
 			interrupts = <16 0>;
 			interrupt-names = "UART1";