Install GRUB as \EFI\BOOT\BOOTARM.EFI in armv7hl
The Default Boot Behavior for EFI if no BootOrder and Boot#### variables
are found is to look for an ESP and start \EFI\BOOT\BOOT{$arch}.efi.
This is usually fallback.efi installed by the shim package, but since shim
isn't used on armv7, there's no \EFI\BOOT\BOOTARM.EFI installed in the ESP.
So install GRUB as \EFI\BOOT\BOOTARM.EFI for armv7 so there is a default
EFI binary to be started.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>