add grub-efi-arm64 to the arm64 OS snap

debian/changelog

@@ -1,6 +1,7 @@
 livecd-rootfs (2.386) UNRELEASED; urgency=medium
 
   * add dpkg.list to assets of the kernel snap
+  * add grub-efi-arm64 to the arm64 OS snap
 
  -- Michael Vogt <michael.vogt@ubuntu.com>  Wed, 09 Mar 2016 23:16:55 +0100
 

live-build/auto/config

@@ -424,7 +424,7 @@ case $PROJECT in
 					add_package install flash-kernel u-boot-tools
 					;;
 				arm64)
-					add_package install u-boot-tools
+					add_package install u-boot-tools grub-efi-arm64
                                         ;;
 			esac
 			OPTS="${OPTS:+$OPTS }--linux-packages=none --initramfs=none"