hs20-osu-client compilation fails on Android O onwards because of
undefined reference for __android_log_print/__android_log_vprint.

Modify hs20-osu-client's Android.mk to include liblog library and
use tag 'hs20-osu-client' in logcat logs. Additionally, compile
hs20-osu-client to /vendor/bin in non-production builds.

Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>