fix(versal): add const qualifier

This correct the MISRA violation C2012-8.13:
A pointer should point to a const-qualified type whenever possible.
Added const qualifier to pointer variables and function arguments.

Change-Id: I33cc594816809a118bff369d98d5689a96f6867f
Signed-off-by: Maheedhar Bollapalli <maheedharsai.bollapalli@amd.com>
diff --git a/plat/xilinx/versal/bl31_versal_setup.c b/plat/xilinx/versal/bl31_versal_setup.c
index 58589ad..377568d 100644
--- a/plat/xilinx/versal/bl31_versal_setup.c
+++ b/plat/xilinx/versal/bl31_versal_setup.c
@@ -76,7 +76,7 @@
 	uint64_t tfa_handoff_addr;
 	uint32_t payload[PAYLOAD_ARG_CNT], max_size = HANDOFF_PARAMS_MAX_SIZE;
 	enum pm_ret_status ret_status;
-	uint64_t addr[HANDOFF_PARAMS_MAX_SIZE];
+	const uint64_t addr[HANDOFF_PARAMS_MAX_SIZE];
 
 	/*
 	 * Do initial security configuration to allow DRAM/device access. On