refactor(n1sdp): update SDS driver calls

Update SDS driver calls to align with recent
changes [1] of the SDS driver.

- The driver now requires us to explicitly pass
  the SDS region id to act on.
- Implement plat_sds_get_regions() platform function
  which is used by the driver to get SDS region
  information per platform.

[1]: https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/24609/

Change-Id: I3447855fbe7427376d5f7aa0ba7356fe2f14d567
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Signed-off-by: David Vincze <david.vincze@arm.com>
diff --git a/plat/arm/board/n1sdp/n1sdp_bl31_setup.c b/plat/arm/board/n1sdp/n1sdp_bl31_setup.c
index 430aab6..27ea7f7 100644
--- a/plat/arm/board/n1sdp/n1sdp_bl31_setup.c
+++ b/plat/arm/board/n1sdp/n1sdp_bl31_setup.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2023, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2024, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -127,13 +127,14 @@
 	int ret;
 	struct n1sdp_plat_info plat_info;
 
-	ret = sds_init();
+	ret = sds_init(SDS_SCP_AP_REGION_ID);
 	if (ret != SDS_OK) {
 		ERROR("SDS initialization failed\n");
 		panic();
 	}
 
-	ret = sds_struct_read(N1SDP_SDS_PLATFORM_INFO_STRUCT_ID,
+	ret = sds_struct_read(SDS_SCP_AP_REGION_ID,
+				N1SDP_SDS_PLATFORM_INFO_STRUCT_ID,
 				N1SDP_SDS_PLATFORM_INFO_OFFSET,
 				&plat_info,
 				N1SDP_SDS_PLATFORM_INFO_SIZE,