[Comgr] Remove -nogpuinc default for HIP compilation

Adding -nogpuinc by default can cause issues for compilations that
require clang to locate HIP runtime headers

Also, hipRTC now sets -nogpuinc manually when needed, so Comgr no
longer needs to manage this option

Change-Id: Id2e3a34c71272dfda8fda618e0719c193a4d6494

Author: lamb-j

amd/comgr/src/comgr-compiler.cpp

@@ -1026,7 +1026,6 @@ amd_comgr_status_t AMDGPUCompiler::addCompilationFlags() {
     break;
   case AMD_COMGR_LANGUAGE_HIP:
     Args.push_back("hip");
-    Args.push_back("-nogpuinc");
     Args.push_back("--offload-device-only");
     Args.push_back("-isystem");
     Args.push_back(ROCMIncludePath.c_str());