mediatek/mt8183: support SAMSUNG and MICRON EMCP LPDDR4X DDR bootup

Support SAMSUNG KMDP6001DA-B425 and MICRON MT29VZZZAD8DQKSL EMCP LPDDR4X DDR

From the calibration log of MICRON MT29VZZZAD8DQKSL, we found
the begin pass range of RX window earlier than with other DDR type.
So need change the DQS starting offset to increase the scan range of RX window.

BUG=b:80501386
BRANCH=none
TEST=Boots correctly on EMCP DRAM

Change-Id: I5fcc8673a2fbd7ec3a8776ab61c57f8903ddda20
Signed-off-by: Huayang Duan <huayang.duan@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32243
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Huayang Duan <huayang.duan@mediatek.corp-partner.google.com>

src/soc/mediatek/mt8183/dramc_pi_calibration_api.c

@@ -32,7 +32,7 @@ enum {
 
 enum {
 	FIRST_DQ_DELAY = 0,
-	FIRST_DQS_DELAY = -10,
+	FIRST_DQS_DELAY = -16,
 	MAX_DQDLY_TAPS = 16,
 	MAX_RX_DQDLY_TAPS = 63,
 };