video: tegra: dc: allow selection of bin_width -1

video: tegra: dc: allow selection of bin_width -1

Valid bin_width values are -1, 1, 2, 4, and 8. We
allow setting of bin_width via sysfs to all these values
except for -1. Add this missing value to the allowed
settings.

Bug 1430681

Change-Id: Icb60574212c203238c6db2d1ada94d3ae3ea9a4f
Signed-off-by: Daniel Solomon <daniels@nvidia.com>
Reviewed-on: http://git-master/r/361792
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Kevin Huang (Eng-SW) <kevinh@nvidia.com>
Reviewed-by: Jon Mayo <jmayo@nvidia.com>