Add Android.bp for libconfig am: 056f47e20d am: 32a274d15e am: 5d5dbcaf7d am: f9ba267a39

Original change: https://android-review.googlesource.com/c/platform/external/libconfig/+/1772394

Change-Id: Ib4f99d6a209cba5f108fc36f9c68b6482a94dc79