soc/intel/cannonlake: Add 4E/4F to early io init

This is needed for the AST2500 to work, because it uses 4E/4F.

Change-Id: Ie47474e9bf1edfe98555a148469c41283e9a4ea6
Signed-off-by: Christian Walter <christian.walter@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34862
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Frans Hendriks <fhendriks@eltan.com>

src/soc/intel/cannonlake/bootblock/pch.c

@@ -159,7 +159,7 @@ static int pch_check_decode_enable(void)
 
 void pch_early_iorange_init(void)
 {
-	uint16_t io_enables = LPC_IOE_SUPERIO_2E_2F | LPC_IOE_KBC_60_64 |
+	uint16_t io_enables = LPC_IOE_EC_4E_4F | LPC_IOE_SUPERIO_2E_2F | LPC_IOE_KBC_60_64 |
 		LPC_IOE_EC_62_66 | LPC_IOE_LGE_200;
 
 	/* IO Decode Range */