broadwell boards: Switch to Lynxpoint GPIO headers

Move `CROS_GPIO_DEVICE_NAME` to a new `chromeos.h` header, because
Lynxpoint uses a different value. Also drop unnecessary includes.

Tested with BUILD_TIMELESS=1, Google Tidus remains identical.

Change-Id: I38baed2c114fb93cfb82535a6ec00fb67e596d64
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50080
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/jecht/chromeos.c

@@ -5,8 +5,9 @@
 #include <device/device.h>
 #include <vendorcode/google/chromeos/chromeos.h>
 #include <ec/google/chromeec/ec.h>
-#include <soc/gpio.h>
+#include <soc/chromeos.h>
 #include <soc/sata.h>
+#include <southbridge/intel/lynxpoint/lp_gpio.h>
 #include "onboard.h"
 
 #define GPIO_SPI_WP	58