Allow phone contact card to switch b/t having/not having social updates

- Make phone portrait and landscape layouts have all views necessary
to switch between showing/hiding social updates. Disable swipe
if only the detail fragment is showing.

- Make ContactDetailActivity use ContactDetailLayoutController to
reduce code duplication, add another state for fragment carousel
in ContactDetailLayoutController

- Make fragment widths in fragment carousel configurable based
on screen width instead of fixed dip value

- Make setAlphaLayerValue() save the alpha value if the view
isn't ready yet (otherwise it's a no-op and the caller must
call it setAlphaLayerValue again when the view is attached) -->
this allows us to remove the code to set fragments in the
fragment carousel every time the data is reloaded

- Remove enableAlphaLayer() code and just make the alpha layer
view visible in the XML

Bug: 5164029

Change-Id: I8f28ac27d125502a12221f084ce253611e6f78a1