Re-added dumpstate.h to libdumpstate_default.cpp.

Without it, the sdk builds fail because they cannot link to
dumpstate_board().

BUG: 32512875
BUG: 31982882
BUG: 26379932

Test: manually built it
Change-Id: I3138f86a7747a09887c231f6c36767913249868e
diff --git a/cmds/dumpstate/libdumpstate_default.cpp b/cmds/dumpstate/libdumpstate_default.cpp
index a5418ea..f3997ab 100644
--- a/cmds/dumpstate/libdumpstate_default.cpp
+++ b/cmds/dumpstate/libdumpstate_default.cpp
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#include "dumpstate.h"
 
 void dumpstate_board(void)
 {