Tegra194: add macros to read GPU reset status

This patch adds macros to check the GPU reset status bit, before
resizing the VideoMem region.

Change-Id: I4377c1ce1ac6d3bd14c7db83526b99d72bdb41ed
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

plat/nvidia/tegra/include/t194/tegra_def.h

@@ -232,5 +232,7 @@
  * Tegra Clock and Reset Controller constants
  ******************************************************************************/
 #define TEGRA_CAR_RESET_BASE		0x200000000
+#define TEGRA_GPU_RESET_REG_OFFSET	0x18UL
+#define  GPU_RESET_BIT			(1UL << 0)
 
 #endif /* __TEGRA_DEF_H__ */