Remove HIGH_RESOLUTION level, adjust FULL requirements.

Allow FULL-level devices to run slower for >= 8MP sizes, with
the slow sizes listed in a different size list to maintain
backwards compatibility with previous FULL requirements.

Remove the redundant HIGH_RESOLUTION level and adjust documentation
to match.

Bug: 20945581
Change-Id: I3baf08361c084b21808461da8bfb254be585ad3a
4 files changed