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/docs/markdown/device_md_gen.py

@@ -456,7 +456,7 @@ __ushort_as_half
 # The dictionary is to place description of each device function. Expand it to all the device functions
 deviceFuncDesc = {'acosf': "This function returns floating point of arc cosine from a floating point input"}
 
-fnames = ["../../include/hip/hcc_detail/math_functions.h","../../include/hip/hcc_detail/device_functions.h","../../include/hip/hcc_detail/hip_fp16.h"]
+fnames = ["../../include/hip/amd_detail/math_functions.h","../../include/hip/amd_detail/device_functions.h","../../include/hip/amd_detail/hip_fp16.h"]
 markdownFileName = "./hip-math-api.md"
 
 preamble = "# HIP MATH APIs Documentation \n"+\