mb/starlabs/starbook/mtl: Enable Early Command Training

Enable Early Command Training.

Test=build and boot `starbook/mtl`, verify no issues in  FSP debug log
and enter/ exit s3.

Change-Id: I18d94537ec662e11ef09065569e1695403490012
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86308
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/starlabs/starbook/variants/mtl/romstage.c

@@ -9,7 +9,7 @@ void mainboard_memory_init_params(FSPM_UPD *mupd)
 {
 	const struct mb_cfg mem_config = {
 		.type = MEM_TYPE_DDR5,
-		.ect = false,
+		.ect = true,
 		.UserBd = BOARD_TYPE_MOBILE,
 		.ddr_config = {
 			.dq_pins_interleaved = false,