Publish system update info when updates are in progress

Publish separate update status when updates are in progress and
device is waiting for restart

Test: m Settings && adb install -r
$ANDROID_PRODUCT_OUT/system_ext/priv-app/Settings/Settings.apk
Bug: 295035851

Change-Id: I42936431791055536fe73d018545dd9b2d658cf0
1 file changed