mb/google/guybrush,mancomb: select GOOGLE_SMBIOS_MAINBOARD_VERSION

Select GOOGLE_SMBIOS_MAINBOARD_VERSION allows querying
board revision from the EC.

BUG=b:187904819
TEST=1. emerge-guybrush coreboot chromeos-bootimage
     2. flash the image to the device and check board rev
        by using command `dmidecode -t 1 | grep Version`

Signed-off-by: Ivy Jian <ivy_jian@compal.corp-partner.google.com>
Change-Id: I48dc83d85cfc49e2e4155e389814fce08693c4bd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54084
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Peers <epeers@google.com>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Rob Barnes <robbarnes@google.com>

src/mainboard/google/guybrush/Kconfig

@@ -24,6 +24,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select ELOG
 	select ELOG_GSMI
 	select FW_CONFIG
+	select GOOGLE_SMBIOS_MAINBOARD_VERSION
 	select HAVE_ACPI_RESUME
 	select HAVE_EM100_SUPPORT
 	select HAVE_SPD_IN_CBFS

src/mainboard/google/mancomb/Kconfig

@@ -21,6 +21,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select ELOG
 	select ELOG_GSMI
 	select FW_CONFIG
+	select GOOGLE_SMBIOS_MAINBOARD_VERSION
 	select HAVE_ACPI_RESUME
 	select HAVE_EM100_SUPPORT
 	select MAINBOARD_HAS_CHROMEOS