fix(arm): only expose `arm_bl2_dyn_cfg_init` to BL2

The `arm_bl2_dyn_cfg_init` function is intended exclusively for BL2 - it
should not be compiled for any other bootloader image. This change hides
it for all but BL2.

Change-Id: I9fa95094dcc30f9fa4cc7bc5b3119ceae82df1ea
Signed-off-by: Chris Kay <chris.kay@arm.com>

include/plat/arm/common/plat_arm.h

@@ -285,10 +285,14 @@ void arm_sp_min_plat_arch_setup(void);
 bool arm_io_is_toc_valid(void);
 
 /* Utility functions for Dynamic Config */
-void arm_bl2_dyn_cfg_init(void);
+
 void arm_bl1_set_mbedtls_heap(void);
 int arm_get_mbedtls_heap(void **heap_addr, size_t *heap_size);
 
+#if IMAGE_BL2
+void arm_bl2_dyn_cfg_init(void);
+#endif /* IMAGE_BL2 */
+
 #if MEASURED_BOOT
 #if DICE_PROTECTION_ENVIRONMENT
 int arm_set_nt_fw_info(int *ctx_handle);

plat/arm/common/arm_dyn_cfg.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2023, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2024, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -120,6 +120,7 @@ void arm_bl1_set_mbedtls_heap(void)
 }
 #endif /* CRYPTO_SUPPORT */
 
+#if IMAGE_BL2
 /*
  * BL2 utility function to initialize dynamic configuration specified by
  * FW_CONFIG. Populate the bl_mem_params_node_t of other FW_CONFIGs if
@@ -229,3 +230,4 @@ void arm_bl2_dyn_cfg_init(void)
 		panic();
 	}
 }
+#endif /* IMAGE_BL2 */