mb/google/brya/var/dochi: Enable LpDdrDqDqsReTraining

FSP default value for LpDdrDqDqsReTraining is 1. For boards
that didn't set LpDdrDqDqsReTraining to any value, 0 was being
assigned and it caused black screen issue.

BUG=b:302465393,b:315739133
TEST=Boot to OS with debug FSP, check LpDdrDqDqsReTraining = 1

Change-Id: I5d61301fddac6630bb1c48e992dd76e5cf02a272
Signed-off-by: Morris Hsu <morris-hsu@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79533
Reviewed-by: Eric Lai <ericllai@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>

src/mainboard/google/brya/variants/dochi/memory.c

@@ -65,6 +65,8 @@ static const struct mb_cfg baseboard_memcfg = {
 		.ccc_config = 0xff,
 	},
 
+	.LpDdrDqDqsReTraining = 1,
+
 	.ect = 1, /* Early Command Training */
 
 	.UserBd = BOARD_TYPE_ULT_ULX,