fix call atcmdbinary when apk in system/app

Change-Id: I386437f7dad3b167f2f3bcb672579c6a0aa97007
change at_cmd to static library

Change-Id: I9e08355738d4dcfa21ef6a75beb647f32f17e6ce
change at_cmd to share library.

Change-Id: Iefe9e49f7347f23796dea8e41ef9066d762d1c54