otautil: Export headers.

Test: mmma bootable/recovery
Change-Id: Ic01b68e2a394d578fc9fc09da2dabe9061b98122
diff --git a/otautil/SysUtil.cpp b/otautil/SysUtil.cpp
index dfa2150..d54a824 100644
--- a/otautil/SysUtil.cpp
+++ b/otautil/SysUtil.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "SysUtil.h"
+#include "otautil/SysUtil.h"
 
 #include <fcntl.h>
 #include <stdint.h>  // SIZE_MAX