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/hipTestNativeHalf.cpp

@@ -155,7 +155,7 @@ void __half2Test(bool* result, __half2 a) {
     result[0] = !(a < a) && result[0];
     result[0] = !(a > a) && result[0];
 
-    #if (__hcc_workweek__ >= 19015) || __HIP_CLANG_ONLY__
+    #if __HIP_CLANG_ONLY__
     // Dot Functions
     result[0] = amd_mixed_dot(a, a, 1, 1) && result[0];
     #endif