Remove client side deferred config for cached state

Since [1], the server side won't send the config change to a
cached state process, until it has an active state again.
So the logic of client side deferring can be removed.

[1]: I09c2feffba2fc124c623796af69de9f6adb60a39

Bug: 217934273
Test: ActivityThreadTest

Change-Id: Ibd113f4fb3b566e4e9cf5d7960b63a5c7790fb75