arm: rpi: Sync rpi dts files from Linux

Sync these files, obtained from Linux v5.15.

This adds a devicetree file for rpi_4 which was not there before.

Testing shows no change so far as I can see:
- boots to U-Boot prompt on rpi0, rpi2
- boots to distro on rpi3
- boots to distro on rpi4

I am assuming that syncing with Linux is safe, but the maintainer should
know for sure.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/bcm2835-rpi-a.dts b/arch/arm/dts/bcm2835-rpi-a.dts
index 067d1f0..11edb58 100644
--- a/arch/arm/dts/bcm2835-rpi-a.dts
+++ b/arch/arm/dts/bcm2835-rpi-a.dts
@@ -8,8 +8,13 @@
 	compatible = "raspberrypi,model-a", "brcm,bcm2835";
 	model = "Raspberry Pi Model A";
 
+	memory@0 {
+		device_type = "memory";
+		reg = <0 0x10000000>;
+	};
+
 	leds {
-		act {
+		led-act {
 			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
 		};
 	};
@@ -94,6 +99,8 @@
 
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_HIGH>;
+	power-domains = <&power RPI_POWER_DOMAIN_HDMI>;
+	status = "okay";
 };
 
 &pwm {
@@ -102,6 +109,13 @@
 	status = "okay";
 };
 
+&sdhost {
+	pinctrl-names = "default";
+	pinctrl-0 = <&sdhost_gpio48>;
+	bus-width = <4>;
+	status = "okay";
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_gpio14>;