feat(drtm): for TPM features fw hash algorithm should be 16-bits

The DRTM 1.0 spec changed the Firmware hash algorithm field
size from 32-bits to 16-bits.

Signed-off-by: Stuart Yoder <stuart.yoder@arm.com>
Change-Id: I713e32e01b1983bf21d97c93bbb28c77dc94a541
diff --git a/include/plat/common/plat_drtm.h b/include/plat/common/plat_drtm.h
index e96e719..81d6d46 100644
--- a/include/plat/common/plat_drtm.h
+++ b/include/plat/common/plat_drtm.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022, Arm Limited. All rights reserved.
+ * Copyright (c) 2022-2024, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -17,7 +17,7 @@
 
 typedef struct {
 	bool tpm_based_hash_support;
-	uint32_t firmware_hash_algorithm;
+	uint16_t firmware_hash_algorithm;
 } plat_drtm_tpm_features_t;
 
 typedef struct {