sb/intel: Add soc/gpio.h

In order to use the common gpio.h header file typedef gpio_t in
soc/gpio.h for Intel common code, Intel lynxpoint and Intel broadwell.

Change-Id: I2049a2cfd75c60d00bdd564b294808760b6aff7f
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88502
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/broadwell/include/soc/gpio.h

@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _BROADWELL_GPIO_H_
+#define _BROADWELL_GPIO_H_
+
+#include <stdint.h>
+
+typedef uint32_t gpio_t;
+
+#endif /* _BROADWELL_GPIO_H_ */