mb/google/mancomb: Enable early EC Software Sync

BUG=b:182211161
TEST=builds

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I9768feaadf2423acd50a71e9a2310b4ab2d1a2a8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52124
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/mainboard/google/mancomb/Kconfig

@@ -26,6 +26,7 @@ config CHROMEOS
 config VBOOT
 	select VBOOT_SEPARATE_VERSTAGE
 	select VBOOT_STARTS_IN_BOOTBLOCK
+	select VBOOT_EARLY_EC_SYNC
 
 config FMDFILE
 	string