Camera: Allow larger preview resolutions in API1 for >= HALv2 devices

Limit preview resolutions to a max of 1920x1920 instead of 1920x1080p,
so that any aspect ratio with a 1920 as the larger dimension can be used.

Also improve the initial preview/video size selection logic, to ensure
that the selected size is both a valid preview and video size, and not
too large.

Bug: 17458832
Change-Id: Iea006fadb5fbf0f03d23c3c5babb5b3611469688