[Base] Refactor hw keys handling with navbar presence (1/2)

This commit removes per hw keys disabler/enabler. Now all hw keys get their functionality observing navbar state. Navbar on = all hw keys disabled and navbar off = all hw keys enabled. Add a check in ViewConfiguration.java to determine presence of navbar for add or remove 3-dots menu button in app that need this.

Partialy remove this commit: https://github.com/cristianomatos/android_frameworks_base/commit/8a736c2763ea190170bb3c49cbdabde2e3d079d2

Change-Id: I6f4fb6c0f3cad20be3b3ce171dc7021a43884f36