EFI: Add VolumeIcon to EFI system partition

Change-Id: Idc50cfee16db5f7c0dbea625a7739ad42b2d7bf0
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2249
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>