mb/clevo/cml-u/bootblock.c: Remove unused includes

Change-Id: I048e906306bf77a941b5f731ade15292fa944390
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50219
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/mainboard/clevo/cml-u/bootblock.c

@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <bootblock_common.h>
-#include <gpio.h>
 #include <variant/gpio.h>
 
 void bootblock_mainboard_early_init(void)