mb/google/volteer: enable Early Command Training

Update memory configuration on Tiger Lake platform to enable Early
Command Training. This feature was not supported before FSP v2527.

BUG=b:150357377
BRANCH=None
TEST= Build and boot volteer

Signed-off-by: Srinidhi N Kaushik <srinidhi.n.kaushik@intel.com>
Change-Id: I674c30f4dfc1af6c0c4a460d66684545a190caf3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40023
Reviewed-by: Dossym Nurmukhanov <dossym@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/volteer/variants/baseboard/memory.c

@@ -58,7 +58,7 @@ static const struct lpddr4x_cfg baseboard_memcfg = {
 		[7] = { 0, 1 },  /* DDR7_DQS[1:0] */
 	},
 
-	.ect = 0, /* Disable Early Command Training */
+	.ect = 1, /* Enable Early Command Training */
 };
 
 const struct lpddr4x_cfg *__weak variant_memory_params(void)

src/mainboard/google/volteer/variants/malefor/memory.c

@@ -52,7 +52,7 @@ static const struct lpddr4x_cfg malefor_memcfg = {
 		[7] = { 0, 1 },  /* DDR7_DQS[1:0] */
 	},
 
-	.ect = 0, /* Disable Early Command Training */
+	.ect = 1, /* Enable Early Command Training */
 };
 
 const struct lpddr4x_cfg *variant_memory_params(void)