otafault: Clean up header inclusion.

Remove unneeded #includes. Also remove unneeded dependency on libz and
libselinux.

Test: mmma bootable/recovery
Change-Id: Ic8f7f46f4b89762dee384921504489de75320ac0
diff --git a/otafault/test.cpp b/otafault/test.cpp
index 6514782..60c40e0 100644
--- a/otafault/test.cpp
+++ b/otafault/test.cpp
@@ -14,9 +14,10 @@
  * limitations under the License.
  */
 
-#include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
 #include <unistd.h>
 
 #include "ota_io.h"