soc/mediatek/mt8189: Reserve DRAM buffers for HW TX TRACKING

HW TX tracking works by writing a pattern to the designated DRAM buffer
and then reading it back automatically to calculate the appropriate TX
time delay. To avoid writing the pattern to system-used memory, we need
to permanently reserve last 64KB memory on each rank for the HW TX
tracking feature.

BUG=b:379008996
BRANCH=none
TEST=Reserve memory ok
Firmware shows the following log :
000000013fff0000-000000013fffffff: RESERVED
000000023fff0000-000000023fffffff: RESERVED

Signed-off-by: Mike Lin <mike.lin@mediatek.corp-partner.google.com>
Change-Id: I2ecfe42dc9f1882163d03f50cf9b5ff8e98c2972
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87039
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yidi Lin <yidilin@google.com>

src/soc/mediatek/mt8189/Makefile.mk

@@ -19,6 +19,7 @@ romstage-y += ../common/emi.c
 romstage-y += ../common/memory.c ../common/memory_test.c
 romstage-y += ../common/mmu_operations.c ../common/mmu_cmops.c
 
+ramstage-y += ../common/dramc_info.c
 ramstage-y += ../common/emi.c
 ramstage-y += ../common/memory.c
 ramstage-y += ../common/mmu_operations.c ../common/mmu_cmops.c

src/soc/mediatek/mt8189/soc.c

@@ -1,9 +1,16 @@
 /* SPDX-License-Identifier: GPL-2.0-only OR MIT */
 
+#include <bootmem.h>
 #include <device/device.h>
+#include <soc/dramc_info.h>
 #include <soc/emi.h>
 #include <symbols.h>
 
+void bootmem_platform_add_ranges(void)
+{
+	reserve_buffer_for_dramc();
+}
+
 static void soc_read_resources(struct device *dev)
 {
 	ram_range(dev, 0, (uintptr_t)_dram, sdram_size());