SWDEV-272673 - Add changes to dump log to a file

Env var AMD_LOG_LEVEL_FILE would dump the log to file.
Change-Id: I6add4a1ae6788f376ce116797cc0573007502e73

rocclr/platform/runtime.cpp

@@ -93,6 +93,9 @@ void Runtime::tearDown() {
   Device::tearDown();
   option::teardown();
   Flag::tearDown();
+  if (outFile != stderr && outFile != nullptr) {
+    fclose(outFile);
+  }
   initialized_ = false;
 }