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This CL enables ZSL for one shot requests. It sets
ANDROID_CONTROL_ENABLE_ZSL to true for still capture requests and a
private usage flag to still capture streams so that adapter recognizes
still capture output streams.

BUG=b:130851309
TEST=Enabled ZSL and verified still capture works with ZSL CLs.

Change-Id: Idb0741f56b55b93a157e7ee11aff4beff2024451
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896480Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Wei Lee <wtlee@chromium.org>
Commit-Queue: Jasmine Chen <lnishan@google.com>
Cr-Commit-Position: refs/heads/master@{#713843}