soc/mediatek/common: Prefer include <soc/gpio.h> via <gpio.h>

Change-Id: I50e874790dedcb6bf3b3ac8368821f22611aa3b7
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82894
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/mediatek/common/tps65132s.c

@@ -3,7 +3,7 @@
 #include <console/console.h>
 #include <delay.h>
 #include <device/i2c_simple.h>
-#include <soc/gpio.h>
+#include <gpio.h>
 #include <soc/i2c.h>
 #include <soc/tps65132s.h>