mb/google/guybrush: Enable DISABLE_SPI_FLASH_ROM_SHARING

Guybrush uses GPIO67 as an input.

BUG=none
TEST=Boot guybrush

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I10068bb6870b2cb96033cf3893cde71db5c1d709
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51781
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/guybrush/Kconfig

@@ -9,6 +9,7 @@ config BOARD_SPECIFIC_OPTIONS
 	def_bool y
 	select AMD_SOC_CONSOLE_UART
 	select BOARD_ROMSIZE_KB_16384
+	select DISABLE_SPI_FLASH_ROM_SHARING
 	select DRIVERS_I2C_GENERIC
 	select DRIVERS_I2C_HID
 	select EC_GOOGLE_CHROMEEC