SWDEV-286150 - Remove GSL backend

Change-Id: Iba9a997ee7d5ff6ac00d5888ff189a4514958fe9

rocclr/utils/flags.cpp

@@ -84,15 +84,11 @@ namespace amd {
 bool IS_HIP = false;
 std::atomic_bool IS_PROFILER_ON(false);
 
-#if defined(WITH_GPU_DEVICE)
-bool IS_LEGACY = true;
-#else
 #if !defined(_WIN32) && defined(WITH_PAL_DEVICE)
 bool IS_LEGACY = true;
 #else
 bool IS_LEGACY = false;
 #endif
-#endif
 
 // static
 char* Flag::envstr_;