feat(drtm): add ACPI table region size to the DLME header

The DRTM 1.0 spec defines an additional field in the DLME
header for an optional region in the DLME to hold ACPI tables.

Signed-off-by: Stuart Yoder <stuart.yoder@arm.com>
Change-Id: Idba7fa6bd0fb4ef2bdffc24f4588720e1661e58c
diff --git a/services/std_svc/drtm/drtm_main.h b/services/std_svc/drtm/drtm_main.h
index e2b2ca9..a7d053f 100644
--- a/services/std_svc/drtm/drtm_main.h
+++ b/services/std_svc/drtm/drtm_main.h
@@ -95,6 +95,7 @@
 	uint64_t dlme_addr_map_size;
 	uint64_t dlme_tpm_log_size;
 	uint64_t dlme_tcb_hashes_table_size;
+	uint64_t dlme_acpi_tables_region_size;
 	uint64_t dlme_impdef_region_size;
 } __aligned(__alignof(uint16_t /* First member's type, `uint16_t version'. */));