Fix DC flush programming in non concurrent scenarios.

-If out of order flag was disabled then pipe control was not having dc flush.
-This could led to a batch buffer that doesn't end with dc flush.
-This change adds differentiation between pipe controls that may be erased and
pipe controls that are used as a part of epilogue command

Change-Id: Ic9c970c75c89ff524a0e40506eff6dd097760145

unit_tests/os_interface/windows/device_command_stream_tests.cpp

@@ -533,6 +533,7 @@ HWTEST_F(WddmCommandStreamMockGdiTest, givenRecordedCommandBufferWhenItIsSubmitt
     LinearStream cs(commandBuffer);
 
     DispatchFlags dispatchFlags;
+    dispatchFlags.guardCommandBufferWithPipeControl = true;
     dispatchFlags.requiresCoherency = true;
     mockCsr->flushTask(cs, 0u, cs, cs, cs, cs, 0u, dispatchFlags);