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/include/bootmem.h

@@ -37,6 +37,7 @@ enum bootmem_type {
 	BM_MEM_NVS,		/* ACPI NVS Memory */
 	BM_MEM_UNUSABLE,	/* Unusable address space */
 	BM_MEM_VENDOR_RSVD,	/* Vendor Reserved */
+	BM_MEM_BL31,		/* Arm64 BL31 exectuable */
 	BM_MEM_TABLE,		/* Ram configuration tables are kept in */
 	/* Tags below this point are ignored for the OS table. */
 	BM_MEM_OS_CUTOFF = BM_MEM_TABLE,
@@ -53,6 +54,7 @@ enum bootmem_type {
  * Bootmem types match to LB_MEM tags, except for the following:
  * BM_MEM_RAMSTAGE : Translates to LB_MEM_RAM.
  * BM_MEM_PAYLOAD  : Translates to LB_MEM_RAM.
+ * BM_MEM_BL31     : Translates to LB_MEM_RESERVED.
  */
 void bootmem_write_memory_table(struct lb_memory *mem);