board/aarch64: add eth0 quirk for Raspberry Pi 400

The RPi 400 has is the exact same hardware as the RPi 4B, so it needs
the same interface quirks, and we can also give it the same factory
config settings.

Also, minor cleanup of genimage.cfg; primarty and secondary do not need
the bootable flag.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

Author: troglobit

board/aarch64/raspberrypi-rpi64/genimage.cfg.in

@@ -43,8 +43,8 @@ image #INFIX_ID##VERSION#-rpi64-sdcard.img {
 
 	partition boot {
 		partition-type = 0xc
-		bootable = "true"
 		image = "boot.vfat"
+		bootable = "true"
 	}
 
 	partition aux {
@@ -54,16 +54,14 @@ image #INFIX_ID##VERSION#-rpi64-sdcard.img {
 
 	partition primary {
 		partition-type-uuid = linux
-		bootable = "true"
-		size = 250M
 		image = "rootfs.squashfs"
+		size = 250M
 	}
 
 	partition secondary {
 		partition-type-uuid = linux
-		bootable = "true"
-		size = 250M
 		image = "rootfs.squashfs"
+		size = 250M
 	}
 
 	partition cfg {

board/aarch64/raspberrypi-rpi64/rootfs/usr/share/product/raspberrypi,400

@@ -0,0 +1 @@
+raspberrypi,4-model-b