Merge "usb: Don't show the notification when no USB device is connected" am: e648d3cb91

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2181961

Change-Id: Ie35515105f4136cb58db281d1ad8f6fcd1832724
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>