staging: media: tegra-video: tegra20: set correct maximum width and height

staging: media: tegra-video: tegra20: set correct maximum width and height

Maximum width and height for Tegra20 and Tegra30 is determined by
respective register field, rounded down to factor of 2, which is 8191U
rounded down to 8190U.

Tested-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # tegra20, parallel camera
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>