efi_loader: imply FAT, FAT_WRITE

The UEFI spec requires support for the FAT file system.
Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>

lib/efi_loader/Kconfig

@@ -15,6 +15,8 @@ config EFI_LOADER
 	select HAVE_BLOCK_DEVICE
 	select REGEX
 	imply CFB_CONSOLE_ANSI
+	imply FAT
+	imply FAT_WRITE
 	imply USB_KEYBOARD_FN_KEYS
 	imply VIDEO_ANSI
 	help