mb/google/guybrush: Enable early EC Software Sync

BUG=None
TEST=Build and boot to OS in Guybrush. Ensure that the EC Software Sync
is complete.

Change-Id: Id8655b6f805e14ce3cb71777c1cc175f45841fcc
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52009
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/mainboard/google/guybrush/Kconfig

@@ -36,6 +36,7 @@ config VBOOT
 	select VBOOT_LID_SWITCH
 	select VBOOT_SEPARATE_VERSTAGE
 	select VBOOT_STARTS_IN_BOOTBLOCK
+	select VBOOT_EARLY_EC_SYNC
 
 config FMDFILE
 	string