Add support for AArch64/ARM64 EFI architecture (#1757)

* Add AArch64/ARM64 EFI boot support (for QEMU and some boards)
* Allow GRUB to load cmdline.txt-like
* Enable qcow2/vmdk disk images

Co-authored-by: Stefan Agner <stefan@agner.ch>

buildroot-external/rootfs-overlay/usr/libexec/hassos-persists

@@ -15,6 +15,18 @@ if [ -e /usr/sbin/fw_setenv ]; then
         echo "[INFO] machine-id is okay"
     fi
 
+###
+# GRUB
+elif [ -e /usr/bin/grub-editenv ]; then
+    GRUBENV_FILE="$(grep '^grubenv=' < /etc/rauc/system.conf | cut -d= -f2)"
+    # machine-id
+    if [ "$(/usr/bin/grub-editenv "$GRUBENV_FILE" list | grep '^MACHINE_ID=' | cut -d= -f2)" != "${MACHINE_ID}" ]; then
+        echo "[INFO] set machine-id to ${MACHINE_ID}"
+        /usr/bin/grub-editenv "$GRUBENV_FILE" set "MACHINE_ID=${MACHINE_ID}"
+    else
+        echo "[INFO] machine-id is okay"
+    fi
+
 ###
 # Barebox
 else