dts: bindings: rename nxp,kinetis-mpu compatible

Rename "nxp,kinetis-mpu" compatible to "nxp,sysmpu" to remove
the device family from its name.

Signed-off-by: Manuel Argüelles <manuel.arguelles@nxp.com>

Author: manuargue

dts/arm/nxp/nxp_k8x.dtsi

@@ -40,7 +40,7 @@
 
 	soc {
 		mpu: mpu@4000d000 {
-			compatible = "nxp,kinetis-mpu";
+			compatible = "nxp,sysmpu";
 			reg = <0x4000d000 0x1000>;
 			status = "disabled";
 		};

dts/arm/nxp/nxp_ke1xf.dtsi

@@ -114,7 +114,7 @@
 		};
 
 		mpu: mpu@4000d000 {
-			compatible = "nxp,kinetis-mpu";
+			compatible = "nxp,sysmpu";
 			reg = <0x4000d000 0x1000>;
 			status = "disabled";
 		};

dts/arm/nxp/nxp_kv5x.dtsi

@@ -35,7 +35,7 @@
 
 	soc {
 		mpu: mpu@4000d000 {
-			compatible = "nxp,kinetis-mpu";
+			compatible = "nxp,sysmpu";
 			reg = <0x4000d000 0x1000>;
 			status = "disabled";
 		};

dts/arm/nxp/nxp_s32k1xx.dtsi

@@ -33,7 +33,7 @@
 		interrupt-parent = <&nvic>;
 
 		mpu: mpu@4000d000 {
-			compatible = "nxp,kinetis-mpu";
+			compatible = "nxp,sysmpu";
 			reg = <0x4000d000 0x1000>;
 			status = "disabled";
 		};