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

tests/src/deviceLib/hipStdComplex.cpp

@@ -151,11 +151,8 @@ void test() {
 }
 
 int main() {
-// ToDo: Fix bug in HCC causing linking error at -O0.
-#ifndef __HCC__
   test<float>();
   test<double>();
-#endif
   passed();
   return 0;
 }