fix(xilinx): resolve misra rule 10.4 violations

Fixed below MISRA violation:
- MISRA Violation: MISRA-C:2012 R.10.4:
  - Both operands of an operator in which the usual arithmetic conversions
    are performed shall have the same essential type category.
- Fix:
  - Made data type same for both the operands.

Change-Id: I0cea19477f3c10265d95ea1d5d2ea151dbf174bb
Signed-off-by: Devanshi Chauhan Alpeshbhai <devanshi.chauhanalpeshbhai@amd.com>
diff --git a/plat/xilinx/common/include/ipi.h b/plat/xilinx/common/include/ipi.h
index d792710..71c06c3 100644
--- a/plat/xilinx/common/include/ipi.h
+++ b/plat/xilinx/common/include/ipi.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2018, Xilinx, Inc. All rights reserved.
+ * Copyright (c) 2022-2025, Advanced Micro Devices, Inc. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -60,7 +61,7 @@
 void ipi_mb_release(uint32_t local, uint32_t remote);
 
 /* Enquire IPI mailbox status */
-int ipi_mb_enquire_status(uint32_t local, uint32_t remote);
+uint32_t ipi_mb_enquire_status(uint32_t local, uint32_t remote);
 
 /* Trigger notification on the IPI mailbox */
 void ipi_mb_notify(uint32_t local, uint32_t remote, uint32_t is_blocking);