bootmem: add new memory type for BL31

After CL:31122, we can finally define a memory type specific for BL31,
to make sure BL31 is not loaded on other reserved area.

Change-Id: Idbd9a7fe4b12af23de1519892936d8d88a000e2c
Signed-off-by: Ting Shen <phoenixshen@google.com>
Reviewed-on: https://review.coreboot.org/c/31123
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/soc/mediatek/mt8173/soc.c

@@ -13,10 +13,16 @@
  * GNU General Public License for more details.
  */
 
+#include <bootmem.h>
 #include <device/device.h>
 #include <symbols.h>
 #include <soc/emi.h>
 
+void bootmem_platform_add_ranges(void)
+{
+	bootmem_add_range(0x101000, 124 * KiB, BM_MEM_BL31);
+}
+
 static void soc_read_resources(struct device *dev)
 {
 	ram_resource(dev, 0, (uintptr_t)_dram / KiB, sdram_size() / KiB);

src/soc/mediatek/mt8183/include/soc/memlayout.ld

@@ -47,4 +47,6 @@ SECTIONS
 	DRAM_START(0x40000000)
 	POSTRAM_CBFS_CACHE(0x40000000, 2M)
 	RAMSTAGE(0x40200000, 256K)
+
+	BL31(0x54600000, 0x60000)
 }