fix(xilinx): resolve misra rule 4.6 violations

Fixed below MISRA violation:
- MISRA Violation: MISRA-C:2012 R.4.6:
  - Typedefs that indicate size and signedness should be used in
    place of the basic numerical types.
- Fix:
  - Used typedefs that indicate size and signedness in place of basic
    numerical types and updated return type of function wherever needed.

Change-Id: Ifde2379ee3f9d5ab30ef695d99f59591af575aba
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 71c06c3..c628496 100644
--- a/plat/xilinx/common/include/ipi.h
+++ b/plat/xilinx/common/include/ipi.h
@@ -38,9 +38,9 @@
 
 /* structure to maintain IPI configuration information */
 struct ipi_config {
-	unsigned int ipi_bit_mask;
-	unsigned int ipi_reg_base;
-	unsigned char secure_only;
+	uint32_t ipi_bit_mask;
+	uint32_t ipi_reg_base;
+	uint8_t secure_only;
 };
 
 /*********************************************************************
@@ -52,7 +52,7 @@
 			   uint32_t total_ipi);
 
 /* Validate IPI mailbox access */
-int ipi_mb_validate(uint32_t local, uint32_t remote, unsigned int is_secure);
+int32_t ipi_mb_validate(uint32_t local, uint32_t remote, uint32_t is_secure);
 
 /* Open the IPI mailbox */
 void ipi_mb_open(uint32_t local, uint32_t remote);