Simplifying writeToParcel for various actions

> Using helper methods when writing and reading typed objects
> Moving the tag write outside the action, as it is read outside
  the action as well
> Removing usused tags

Test: am instrument -w -e class android.widget.RemoteViewsTest com.android.frameworks.coretests/android.support.test.runner.AndroidJUnitRunner
Bug: 65574108
Change-Id: Iaf51cae6ef9f82b70dc1f19c2f019af40c4424a2