Don't update everything when only refreshrate changes

This was going through the whole display-info-changed flow
when only the refreshrate changed. This was causing updates
with outdated information (where displaymanager callback
happens before configurationchanged). The result is that
things like touch-monitors (based on display info) were
out-of-sync with view content (which is based on configuration).

This change just updates the local record of screenrefresh
when it changes.

Bug: 179308296
Test: With fixed-rotation-in-config, open recents and repeatedly
      rotate the device. Make sure touch regions stay aligned
      with recents content.
Change-Id: I9a8c553dfa55ec4402edcecac44bc87cb51c75fc