Remove releasetools

No need to have all this duplicate code when we can override
non-writable boot partition with a single line fstab addition

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>
fstab: Add fake boot partition

Needed to complete the build without using custom releasetools

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>
overlay: update autobrightness button values

see if this helps with the blinking keyboard issues

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>