otafault: Move headers under otafault/.

Test: mmma bootable/recovery
Change-Id: I3ceb72f703c7c2857d656c137d71baa1fccd8238
diff --git a/otafault/config.cpp b/otafault/config.cpp
index c11f774..3993948 100644
--- a/otafault/config.cpp
+++ b/otafault/config.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "config.h"
+#include "otafault/config.h"
 
 #include <map>
 #include <string>
@@ -22,7 +22,7 @@
 #include <android-base/stringprintf.h>
 #include <ziparchive/zip_archive.h>
 
-#include "ota_io.h"
+#include "otafault/ota_io.h"
 
 #define OTAIO_MAX_FNAME_SIZE 128