mb/google/sarien: Update GBB flags

Disable the GBB flag forcing manual recovery now that we can read
the manual recovery from H1.

Enable the GBB flag to skip EC software sync, since images built
from coreboot.org do not include the EC binaries by default.

Change-Id: I0e1d6304e3e29eda68c7b807cf0774275c37d710
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32476
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/sarien/Kconfig

@@ -37,7 +37,7 @@ config CHROMEOS
 	select GBB_FLAG_FORCE_DEV_SWITCH_ON
 	select GBB_FLAG_FORCE_DEV_BOOT_USB
 	select GBB_FLAG_FORCE_DEV_BOOT_LEGACY
-	select GBB_FLAG_FORCE_MANUAL_RECOVERY
+	select GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC
 
 config DIMM_MAX
 	int