Bug#1127405: grub-efi-loong64: Print "efi_uga" error during the startup of the loong64 machine.

[larryw3i]

Dear Maintainer,

The GRUB didn't print the 'efi_uga' error since upgrading to version 
`2.14-2`, and this `report log` can be closed now! Thanks!

Regards,

larryw3i