mb/google/sarien: Enable board_id feature

Enable the Kconfig option to automatically read the board ID
and populate it into the SMBIOS tables.

BUG=b:123261132
TEST=verify current board id from the OS:
cat /sys/class/dmi/id/board_version
rev1

Change-Id: Id41631bfaa627ca9d5034e2ebe93f8ace2ffdad8
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32277
Reviewed-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/sarien/Kconfig

@@ -9,6 +9,7 @@ config BOARD_GOOGLE_BASEBOARD_SARIEN
 	select DRIVERS_USB_ACPI
 	select EC_GOOGLE_WILCO
 	select GENERIC_SPD_BIN
+	select GOOGLE_SMBIOS_MAINBOARD_VERSION
 	select HAVE_ACPI_RESUME
 	select HAVE_ACPI_TABLES
 	select INTEL_LPSS_UART_FOR_CONSOLE