ARM: dts: Use simple-pm-bus for genpd for am4 l4_per

We can now enable simple-pm-bus to use genpd.
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am437x-l4.dtsi

@@ -610,7 +610,10 @@ target-module@400000 {			/* 0x4a400000, ap 5 08.0 */
 };
 
 &l4_per {					/* 0x48000000 */
-	compatible = "ti,am4-l4-per", "simple-bus";
+	compatible = "ti,am4-l4-per", "simple-pm-bus";
+	power-domains = <&prm_per>;
+	clocks = <&l4ls_clkctrl AM4_L4LS_L4_LS_CLKCTRL 0>;
+	clock-names = "fck";
 	reg = <0x48000000 0x800>,
 	      <0x48000800 0x800>,
 	      <0x48001000 0x400>,
@@ -628,7 +631,7 @@ &l4_per {					/* 0x48000000 */
 		 <0x46400000 0x46400000 0x400000>;	/* l3 data port */
 
 	segment@0 {					/* 0x48000000 */
-		compatible = "simple-bus";
+		compatible = "simple-pm-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0x00000000 0x00000000 0x000800>,	/* ap 0 */
@@ -1203,7 +1206,7 @@ hwspinlock: spinlock@0 {
 	};
 
 	segment@100000 {					/* 0x48100000 */
-		compatible = "simple-bus";
+		compatible = "simple-pm-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0x0008c000 0x0018c000 0x001000>,	/* ap 34 */
@@ -1634,7 +1637,7 @@ mmc2: mmc@0 {
 	};
 
 	segment@200000 {					/* 0x48200000 */
-		compatible = "simple-bus";
+		compatible = "simple-pm-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0x00000000 0x00200000 0x010000>;
@@ -1658,7 +1661,7 @@ mpu@0 {
 	};
 
 	segment@300000 {					/* 0x48300000 */
-		compatible = "simple-bus";
+		compatible = "simple-pm-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0x00000000 0x00300000 0x001000>,	/* ap 56 */