drivers: vision: Fix compatibility with 6.1 kernel

Update CHANGES.md for the 2021-04-02 release

Change-Id: I277b284f23aed5301fc583c63cc6dd845594a458

Update CHANGES.md for the latest release

Change-Id: Id570c1b5b1424bea282f4325a0c2584bc548ffdc

Update hacking instructions

Change-Id: I381c3f2f7cdf5753a5fe496f9c896f09877da18a

Update HACKING.md.

Change-Id: Ib4402ecde289d2a1d074e34c436e6060b58aa801

Update debian changelog and bump package version.

Change-Id: I80bb5a73e2f9b7c12c6b51152fa7d4c1bc0b3145

Update version

Change-Id: If3ebd9b13a65c2717ead6df25dba48df3fb62a1e
(cherry picked from commit bbad60d7476dfd3c49c3105c334c4d46d88f72d5)

Use system-wide python to run desktop check scripts

Change-Id: Ideeb546005f4b7b3ed8ee8125f7a9ec2d841703e

Direct support for grayscale images.

Grayscale images are interpreted by VisionBonnet as RGB where all
channels are the same. This is just an optimization to send 3 times less
data over SPI.

Change-Id: I0322cbff8381f295772b1eadead0a4d0d7f335fc

Update to Cloud Speech v1 (google#206)

The v1beta1 endpoint has been shut down, so this is necessary for using
the Cloud Speech demo now.

See google#205.