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/bcm2837-rpi-3-b.dts b/arch/arm/dts/bcm2837-rpi-3-b.dts
index ce71f57..dd4a486 100644
--- a/arch/arm/dts/bcm2837-rpi-3-b.dts
+++ b/arch/arm/dts/bcm2837-rpi-3-b.dts
@@ -15,11 +15,12 @@
 	};
 
 	memory@0 {
+		device_type = "memory";
 		reg = <0 0x40000000>;
 	};
 
 	leds {
-		act {
+		led-act {
 			gpios = <&expgpio 2 GPIO_ACTIVE_HIGH>;
 		};
 	};
@@ -125,6 +126,8 @@
 
 &hdmi {
 	hpd-gpios = <&expgpio 4 GPIO_ACTIVE_LOW>;
+	power-domains = <&power RPI_POWER_DOMAIN_HDMI>;
+	status = "okay";
 };
 
 /* uart0 communicates with the BT module */