feat(drtm): add platform API to retrieve ACPI tables region size

Introduces a platform-specific API to retrieve the ACPI table
region size. This will be used in a subsequent patch to specify
the minimum DLME size requirement for the DCE preamble.

Change-Id: I44ce9241733b22fea3cbce9d42f1c2cc5ef20852
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/include/plat/common/plat_drtm.h b/include/plat/common/plat_drtm.h
index 07545a6..4f69210 100644
--- a/include/plat/common/plat_drtm.h
+++ b/include/plat/common/plat_drtm.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022-2024, Arm Limited. All rights reserved.
+ * Copyright (c) 2022-2025, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -59,6 +59,8 @@
 uint64_t plat_drtm_get_tcb_hash_table_size(void);
 uint64_t plat_drtm_get_imp_def_dlme_region_size(void);
 uint64_t plat_drtm_get_tcb_hash_features(void);
+uint64_t plat_drtm_get_acpi_tables_region_size(void);
+
 
 /* DRTM error handling functions */
 int plat_set_drtm_error(uint64_t error_code);