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/Android.bp b/cmds/dumpstate/Android.bp
index 3db41c2..db61661 100644
--- a/cmds/dumpstate/Android.bp
+++ b/cmds/dumpstate/Android.bp
@@ -1,4 +1,6 @@
 cc_library_static {
     name: "libdumpstate.default",
     srcs: ["libdumpstate_default.cpp"],
+    // TODO: should use libdumpstateheaders, but if fails with 'undefined'
+    static_libs: ["libbase", "libziparchive", "libz"]
 }