efi_loader: Fix GOP 32bpp exposure

We store pixels as BGRA in memory, as can be seen from struct efi_gop_pixel.
So we need to expose the same format to UEFI payloads to actually have them
use the correct colors.

Reported-by: Fabian Vogt <fvogt@suse.com>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

lib/efi_loader/efi_gop.c

@@ -472,7 +472,7 @@ efi_status_t efi_gop_register(void)
 	gopobj->info.version = 0;
 	gopobj->info.width = col;
 	gopobj->info.height = row;
-	gopobj->info.pixel_format = EFI_GOT_RGBA8;
+	gopobj->info.pixel_format = EFI_GOT_BGRA8;
 	gopobj->info.pixels_per_scanline = col;
 
 	gopobj->bpix = bpix;