mb/google/kukui: Add Micron 8GB discrete LPDDR4X DDR support

Support 8GB MT53E2G32D4NQ-046 discrete DDR bootup.

BUG=b:159301679
BRANCH=kukui
TEST=Boots correctly on Kukui.

Change-Id: Ide01f029c5ebd6c3ae6350f73f3c60b818d51353
Signed-off-by: Huayang Duan <huayang.duan@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44011
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/mainboard/google/kukui/sdram_configs.c

@@ -20,6 +20,7 @@ static const char *const sdram_configs[] = {
 	[6] = "sdram-lpddr4x-KMDV6001DA-B620-4GB",
 	[7] = "sdram-lpddr4x-SDADA4CR-128G-4GB",
 	[8] = "sdram-lpddr4x-K4UBE3D4AA-MGCL-4GB",
+	[9] = "sdram-lpddr4x-MT53E2G32D4NQ-046-8GB",
 	[10] = "sdram-lpddr4x-H9HCNNNCPMMLXR-NEE-4GB",
 #endif
 };

src/mainboard/google/kukui/sdram_params/Makefile.inc

@@ -14,6 +14,7 @@ else
   sdram-params += sdram-lpddr4x-KMDV6001DA-B620-4GB
   sdram-params += sdram-lpddr4x-SDADA4CR-128G-4GB
   sdram-params += sdram-lpddr4x-H9HCNNNCPMMLXR-NEE-4GB
+  sdram-params += sdram-lpddr4x-MT53E2G32D4NQ-046-8GB
 endif
 
 $(foreach params,$(sdram-params), \

src/mainboard/google/kukui/sdram_params/sdram-lpddr4x-MT53E2G32D4NQ-046-8GB.c

@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <soc/emi.h>
+
+struct sdram_params params = {
+	.source = DRAMC_PARAM_SOURCE_SDRAM_CONFIG,
+	.frequency = 1600,
+	.wr_level = {
+		[CHANNEL_A] = { {0x1F, 0x19}, {0x20, 0x1A} },
+		[CHANNEL_B] = { {0x22, 0x1E}, {0x22, 0x1E} }
+	},
+	.cbt_cs_dly = {
+		[CHANNEL_A] = {0x5, 0x4},
+		[CHANNEL_B] = {0x8, 0x8}
+	},
+	.cbt_final_vref = {
+		[CHANNEL_A] = {0x56, 0x56},
+		[CHANNEL_B] = {0x56, 0x56}
+	},
+	.emi_cona_val = 0xF053F154,
+	.emi_conh_val = 0x44440003,
+	.emi_conf_val = 0x00421000,
+	.chn_emi_cona_val = {0x0444F051, 0x0444F051},
+	.cbt_mode_extern = CBT_NORMAL_MODE,
+	.delay_cell_unit = 868,
+};