soc/intel/broadwell/pch: Prepare to drop gpio.h

Use `lp_gpio.h` from Lynxpoint instead. Subsequent commits will update
the mainboards and then drop all GPIO code from Broadwell.

Tested with BUILD_TIMELESS=1, Google Tidus remains identical.

Change-Id: Idef89037c2ca781ac3e921abb4b3dc3f7c4b3b5f
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50079
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/broadwell/pch/lpc.c

@@ -13,7 +13,6 @@
 #include <acpi/acpi_gnvs.h>
 #include <cpu/x86/smm.h>
 #include <string.h>
-#include <soc/gpio.h>
 #include <soc/iobp.h>
 #include <soc/iomap.h>
 #include <soc/lpc.h>
@@ -26,6 +25,7 @@
 #include <soc/intel/broadwell/pch/chip.h>
 #include <acpi/acpigen.h>
 #include <southbridge/intel/common/rtc.h>
+#include <southbridge/intel/lynxpoint/lp_gpio.h>
 
 static void pch_enable_ioapic(struct device *dev)
 {