soc/intel/cannonlake: add gpio files to make

Adds gpio.c to romstage and ramstage.
Adds select GENERIC_GPIO_LIB to CPU_SPECIFIC_OPTIONS.

Change-Id: I4931f6c6f089cc54ea168cf4a80d268d983a61de
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/21283
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/cannonlake/Kconfig

@@ -16,6 +16,7 @@ config CPU_SPECIFIC_OPTIONS
 	select BOOT_DEVICE_SUPPORTS_WRITES
 	select C_ENVIRONMENT_BOOTBLOCK
 	select CPU_INTEL_FIRMWARE_INTERFACE_TABLE
+	select GENERIC_GPIO_LIB
 	select HAVE_HARD_RESET
 	select HAVE_INTEL_FIRMWARE
 	select HAVE_MONOTONIC_TIMER

src/soc/intel/cannonlake/Makefile.inc

@@ -19,6 +19,7 @@ bootblock-y += memmap.c
 bootblock-y += spi.c
 bootblock-$(CONFIG_UART_DEBUG) += uart.c
 
+romstage-y += gpio.c
 romstage-y += gspi.c
 romstage-y += memmap.c
 romstage-y += pmutil.c
@@ -28,6 +29,7 @@ romstage-$(CONFIG_UART_DEBUG) += uart.c
 
 ramstage-y += chip.c
 ramstage-y += cpu.c
+ramstage-y += gpio.c
 ramstage-y += gspi.c
 ramstage-y += memmap.c
 ramstage-y += pmutil.c