Skip sufficiency check during network selection when MBB usable

Increases the chance to connect to something better. Also refactors
existing code to be more clear.

Removes the code that adds empty cmmState since the intended
functionality is already met with the skip sufficiency check boolean
flag.

Bug: 328280826
Bug: 322525712
Test: atest com.android.server.wifi
Test: manually
Change-Id: I41413ea68f4b2e2a4215d79cc49eaed7027691c7