Consolidate all util.hpp

This deletes all lower level util.hpp and cats them
into the top level util.hpp to avoid name conflicts.

Change-Id: Ia11e4a08053a3970b0aadf21d1156ab26def36bd
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/pid/util.cpp b/pid/util.cpp
index 5c6e5d4..0a8f892 100644
--- a/pid/util.cpp
+++ b/pid/util.cpp
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#include "util.hpp"
+
 #include "ec/pid.hpp"
 
 #include <cstring>