Remove hip-hcc codes: Part three

1.Rename include/hip/hcc_detail/ as include/hip/amd_detail/

2.Rename include/hip/nvcc_detail/ as include/hip/nvidia_detail/

3.Create __HIP_PLATFORM_AMD__ to replace __HIP_PLATFORM_HCC__

4.Create __HIP_PLATFORM_NVIDIA__ to replace __HIP_PLATFORM_NVCC__

After hcc_detail, nvcc_detail, __HIP_PLATFORM_HCC__ and __HIP_PLATFORM_NVCC__
have been removed from upstream, they will be removed from hip runtime.

Change-Id: I1ae457effd739d6c25bca203c1724b026be21fce

hipamd/tests/unit/test_common.h

@@ -359,7 +359,7 @@ bool freeArrays(T* A_d, T* B_d, T* C_d, T* A_h, T* B_h, T* C_h, bool usePinnedHo
     return freeArraysForHost(A_h, B_h, C_h, usePinnedHost);
 }
 
-#if defined(__HIP_PLATFORM_HCC__)
+#if defined(__HIP_PLATFORM_AMD__)
 template <typename T>
 bool initArrays2DPitch(T** A_d, T** B_d, T** C_d, size_t* pitch_A, size_t* pitch_B, size_t* pitch_C,
                        size_t numW, size_t numH) {