Camera2/3: For still captures, use widest FPS range available.

Instead of using the application-selected preview FPS range for still
captures, select the widest FPS range advertised by the device and use
it for still captures instead, to give the HAL the widest range of exposure
values to choose from possible.

Bug: 10842868
Change-Id: I0e24f5eb713a4f8df116cd5979a84390cc0974d7