mb/google/sarien: Call EC romstage init function

When in romstage call into the EC init function so it can send a
progress code to the EC before memory training starts.

BUG=b:127875364
TEST=boot with FSP debug and ensure EC does not try to turn off the
system while it is still booting.

Change-Id: I5d99fb16bae250a82b652c530c13977e74c3378b
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32092
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/google/sarien/romstage.c

@@ -13,6 +13,7 @@
  * GNU General Public License for more details.
  */
 
+#include <ec/google/wilco/romstage.h>
 #include <soc/cnl_memcfg_init.h>
 #include <soc/romstage.h>
 
@@ -49,5 +50,7 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 		.spd_smbus_address[2] = 0xa4
 	};
 
+	wilco_ec_romstage_init();
+
 	cannonlake_memcfg_init(&memupd->FspmConfig, &memcfg, &spd);
 }