added new field to hipDeviceProp_t structure gcnArch.

1. It is an integer containing gfx values 701, 801, 802, 803
2. On NV path, it is zero

Change-Id: I2b4c7f48981d0214d8c6b1905d2cc85b16203419

include/hip/hip_runtime_api.h

@@ -106,6 +106,7 @@ typedef struct hipDeviceProp_t {
     size_t maxSharedMemoryPerMultiProcessor;    ///< Maximum Shared Memory Per Multiprocessor.
     int isMultiGpuBoard;                        ///< 1 if device is on a multi-GPU board, 0 if not.
     int canMapHostMemory;                       ///< Check whether HIP can map host memory
+    int gcnArch;                                ///< AMD GCN Arch Value. Eg: 803, 701
  } hipDeviceProp_t;