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/tests/src/deviceLib/hipTestDotFunctions.cpp

@@ -32,7 +32,7 @@ THE SOFTWARE.
 
 
 __global__ void DotFunctions(bool* result) {
-    #if (__hcc_workweek__ >= 19015) || __HIP_CLANG_ONLY__
+    #if __HIP_CLANG_ONLY__
     // Dot Functions
     short2 sa{1}, sb{1};
     result[0] = amd_mixed_dot(sa, sb, 1, result[0]) && result[0];