feat(zynqmp): remove unused pm_get_proc_by_node()

The pm_get_proc_by_node() is not used anywhere. Hence remove the
same.

Change-Id: Ifd68dd524cae0a9f1684d943019563027859ccea
Signed-off-by: Ronak Jain <ronak.jain@amd.com>
diff --git a/plat/xilinx/common/include/pm_client.h b/plat/xilinx/common/include/pm_client.h
index a87923f..e9c36c3 100644
--- a/plat/xilinx/common/include/pm_client.h
+++ b/plat/xilinx/common/include/pm_client.h
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2013-2019, Arm Limited and Contributors. All rights reserved.
  * Copyright (c) 2020-2022, Xilinx, Inc. All rights reserved.
- * Copyright (c) 2022-2023, Advanced Micro Devices, Inc. All rights reserved.
+ * Copyright (c) 2022-2024, Advanced Micro Devices, Inc. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -31,7 +31,6 @@
 
 #if defined(PLAT_zynqmp)
 enum pm_ret_status pm_set_suspend_mode(uint32_t mode);
-const struct pm_proc *pm_get_proc_by_node(enum pm_node_id nid);
 #endif /* PLAT_zynqmp */
 
 #endif /* PM_CLIENT_H */