fix(zynqmp): add external declaration

This corrects the MISRA violation C2012-8.4:
A compatible declaration shall be visible when an object or
function with external linkage is defined.

Change-Id: I0e554972c24b70abd5b563639482f267cd4e1b5e
Signed-off-by: Nithin G <nithing@amd.com>
Signed-off-by: Maheedhar Bollapalli <maheedharsai.bollapalli@amd.com>

plat/xilinx/zynqmp/aarch64/zynqmp_common.c

@@ -14,6 +14,7 @@
 #include <lib/smccc.h>
 #include <lib/xlat_tables/xlat_tables_v2.h>
 #include <plat/common/platform.h>
+#include <plat_arm.h>
 #include <services/arm_arch_svc.h>
 
 #include <plat_ipi.h>

plat/xilinx/zynqmp/custom_sip_svc.c

@@ -8,6 +8,8 @@
 #include <common/debug.h>
 #include <smccc_helpers.h>
 
+#include <custom_svc.h>
+
 uint64_t custom_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
 			    uint64_t x3, uint64_t x4, void *cookie,
 			    void *handle, uint64_t flags)

plat/xilinx/zynqmp/plat_topology.c

@@ -5,6 +5,8 @@
  */
 #include <stdint.h>
 
+#include <plat/common/platform.h>
+
 static const uint8_t plat_power_domain_tree_desc[] = {1, 4};
 
 const uint8_t *plat_get_power_domain_tree_desc(void)

plat/xilinx/zynqmp/pm_service/zynqmp_pm_svc_main.c

@@ -22,6 +22,7 @@
 #include <plat_private.h>
 #include "pm_client.h"
 #include "pm_ipi.h"
+#include "pm_svc_main.h"
 #include "zynqmp_pm_api_sys.h"
 #include "zynqmp_pm_defs.h"