soc/mediatek: Add a configurate "USE_CBMEM_DRAM_INFO"

The memory initialization reference code didn't support returning
DRAM information in the old platforms, for example MT8192 and MT8195.
So we have to add a new configuration USE_CBMEM_DRAM_INFO to make
sure the common code will try to get DRAM information on new
platforms supporting that.

BUG=none
TEST=build pass

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: Iebe9ea0c1d01890b09fdf586813d85adde9702e1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63109
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/soc/mediatek/common/Kconfig

@@ -50,4 +50,10 @@ config MTK_DFD
 	  and dumps to internal RAM on the WDT reset. We reserve 1MB on DRAM
 	  to store logs of DFD.
 
+config USE_CBMEM_DRAM_INFO
+	bool "Support filling dram information to cbmem"
+	help
+	  The DRAM initialization will keep and return DRAM information (size,
+	  geometry and other DDR info) so we can fill that into the CBMEM.
+
 endif

src/soc/mediatek/common/memory.c

@@ -134,6 +134,12 @@ static void add_mem_chip_info(int unused)
 	struct mem_chip_info *mc;
 	size_t size;
 
+	if (!CONFIG(USE_CBMEM_DRAM_INFO)) {
+		printk(BIOS_DEBUG,
+		       "DRAM-K: CBMEM DRAM info is unsupported (USE_CBMEM_DRAM_INFO)\n");
+		return;
+	}
+
 	size = sizeof(*mc) + sizeof(struct mem_chip_channel) * CHANNEL_MAX;
 	mc = cbmem_add(CBMEM_ID_MEM_CHIP_INFO, size);
 	assert(mc);