ec/google/wilco: Enable software sync for VBOOT

Enable software sync by default if VBOOT is enabled.
The slow update option is also needed, but this is moving
to depthcharge so it is not defined here.

Change-Id: I046661fae7315f84e96293532b4e1568558df962
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31920
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/ec/google/wilco/Kconfig

@@ -3,6 +3,7 @@ config EC_GOOGLE_WILCO
 	default n
 	select EC_GOOGLE_COMMON_MEC
 	select EC_ACPI
+	select VBOOT_EC_SOFTWARE_SYNC if VBOOT
 	help
 	  Google Wilco Embedded Controller interface.