Remove hip-hcc codes: Part four

Remove __HCC__, __HCC_ONLY__, __HCC_CPP__, __HCC_C__,
__HCC_OR_HIP_CLANG__, __HIP_ROCclr__ and their guarded codes.

Remove Hcc codes from directed_tests and samples.

Remove __HIP_PLATFORM_HCC__ and __HIP_PLATFORM_NVCC__ from
some files where they are not necessary.

Add deprecation notice.

Change-Id: I1ae467eafd749d6c25bca204c1724b026be21fce


[ROCm/hip commit: b34dd95124]

projects/hip/samples/2_Cookbook/12_cmake_hip_add_executable/Readme.md

@@ -28,7 +28,7 @@ If your project already modifies ```CMAKE_MODULE_PATH```, you will need to appen
 ## Using the hip_add_executable macro
 FindHIP provides the ```hip_add_executable``` macro that is similar to the ```cuda_add_executable``` macro that is provided by FindCUDA.
 The syntax is also similar. The ```hip_add_executable``` macro uses the hipcc wrapper as the compiler.
-The macro supports specifying HCC-specific, CLANG-specific, NVCC-specific compiler options using the ```HCC_OPTIONS```, ```CLANG_OPTIONS``` and ```NVCC_OPTIONS``` keywords.
+The macro supports specifying CLANG-specific, NVCC-specific compiler options using the ```CLANG_OPTIONS``` and ```NVCC_OPTIONS``` keywords.
 Common options targeting both compilers can be specificed after the ```HIPCC_OPTIONS``` keyword.
 
 ## How to build and run: