Merge "Clear buffer on reconnect & check poll() result" into main am: 188eccc4 am: 5353f92b

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2869329



Change-Id: I1177e136e08e3d05ec00a8ee7f7390d29c35637e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>