Pointer Icon Refactor: Allow presentation mode to be set without display

When PointerChoreographer is enabled, each PointerController will have
its mode set during construction, and the mode will never change. Allow
the mode to be set before the viewport is assigned to it.

Bug: 293587049
Test: manual
Change-Id: I1329a5635407f4af4c201ab876f540085b3747d7