init-install-efi.sh: improve info message

Let users know that the installation was successful and that pressing
Enter would lead to a reboot.

(From OE-Core rev: a5993d9afab060d07213c14c0188422c9e258693)

Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/initrdscripts/files/init-install-efi.sh

@@ -291,7 +291,7 @@ umount /boot
 
 sync
 
-echo "Remove your installation media, and press ENTER"
+echo "Installation successful. Remove your installation media and press ENTER to reboot."
 
 read enter