Tegra: memctrl_v2: fix "overflow before widen" coverity issue

This patch fixes a coding error, where the size of the protected memory area
was truncated due to an incorrect typecast.

This defect was found by coverity and reported as CID 336781.

Change-Id: I41878b0a9a5e5cd78ef3393fdc7b9ea7f7403ed3
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

plat/nvidia/tegra/common/drivers/memctrl/memctrl_v2.c

 /*
  * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2019, NVIDIA Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -360,17 +361,15 @@ void tegra_memctrl_videomem_setup(uint64_t phys_base, uint32_t size_in_bytes)
 
 	if ((phys_base > vmem_end_old) || (video_mem_base > vmem_end_new)) {
 		tegra_clear_videomem(video_mem_base,
-				     (uint32_t)video_mem_size_mb << 20U);
+				     video_mem_size_mb << 20U);
 	} else {
 		if (video_mem_base < phys_base) {
 			non_overlap_area_size = phys_base - video_mem_base;
-			tegra_clear_videomem(video_mem_base,
-					(uint32_t)non_overlap_area_size);
+			tegra_clear_videomem(video_mem_base, non_overlap_area_size);
 		}
 		if (vmem_end_old > vmem_end_new) {
 			non_overlap_area_size = vmem_end_old - vmem_end_new;
-			tegra_clear_videomem(vmem_end_new,
-					(uint32_t)non_overlap_area_size);
+			tegra_clear_videomem(vmem_end_new, non_overlap_area_size);
 		}
 	}