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

tests/src/runtimeApi/memory/hipMallocManaged_MultiScenario.cpp

@@ -206,7 +206,7 @@ bool NegativeTestsMallocManaged(int NumDevices) {
     IfTestPassed = false;
   }
 
-#ifdef __HIP_PLATFORM_HCC__
+#ifdef __HIP_PLATFORM_AMD__
   // The flag hipMemAttachHost is currently not supported therefore
   // api should return "hipErrorInvalidValue" for now
   err = hipMallocManaged(&A, 1024, hipMemAttachHost);
@@ -215,7 +215,7 @@ bool NegativeTestsMallocManaged(int NumDevices) {
            hipGetErrorString(err));
     IfTestPassed = false;
   }
-#endif  // __HIP_PLATFORM_HCC__
+#endif  // __HIP_PLATFORM_AMD__
 
   err = hipMallocManaged(NULL, 0, 0);
   if (hipErrorInvalidValue != err) {