Make shim use fallback when appropriate.
Make shim use fallback when appropriate.

If we're called as /BOOT/EFI/BOOT*.EFI, and /BOOT/EFI/FALLBACK.EFI exists,
give it a shot.

Signed-off-by: Peter Jones <2e0a021e603479ff81838c00c3b770daca4e0214@redhat.com>

android-ia/platform_external_uefi_shim,rhinstaller/shim,CyanogenMod/android_external_uefi_shim,rhinstaller/shim,android-ia/platform_external_uefi_shim,android-ia/platform_external_uefi_shim,CyanogenMod/android_external_uefi_shim,CyanogenMod/android_external_uefi_shim,rhinstaller/shim