mb/google/zoombini: re-enable software sync

we had disabled software sync for bringup - we now have enough
functionality in place to turn on software sync.

Change-Id: Ib7f5a24ed8a47cb44b3f505e3cd49e0cb6931dc0
Signed-off-by: Caveh Jalali <caveh@google.com>
Reviewed-on: https://review.coreboot.org/23630
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/zoombini/Kconfig b/src/mainboard/google/zoombini/Kconfig
index efea566..4b523c3 100644
--- a/src/mainboard/google/zoombini/Kconfig
+++ b/src/mainboard/google/zoombini/Kconfig
@@ -90,7 +90,6 @@
 	select EC_GOOGLE_CHROMEEC_SWITCHES
 	select HAS_RECOVERY_MRC_CACHE
 	select MRC_CLEAR_NORMAL_CACHE_ON_RECOVERY_RETRAIN
-	select GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC
 	select VBOOT_LID_SWITCH if BASEBOARD_ZOOMBINI_LAPTOP
 
 # Select this option to enable use of cr50 I2C TPM on zoombini.