Kernel freeze is occurring due to incorrect cleanup
in vi5.c.

Fix for kernel freeze:
1 Don't call vi_channel_drv_unregister() and
  tegra_vi_media_controller_cleanup() in vi5_remove.
2 capture_vi_probe() is calling vi_channel_drv_register() and
  tegra_capture_vi_media_controller_init(), so capture_vi_remove()
  should call vi_channel_drv_unregister() and
  tegra_vi_media_controller_cleanup()
3 Use correct dev pointer in vi_channel_drv_unregister().

Code cleanup:
1 Remove use_legacy_path variable that was used for T186.
2 Removed unused t194_vi5_file_private struct.

Bug 4415340

Change-Id: I6153f65d62a9f7f4fc5d04c2ace948a29396e404
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3077660


Reviewed-by: Shubham Chandra <shubhamc@nvidia.com>
Reviewed-by: Ankur Pawar <ankurp@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
Tested-by: Ankur Pawar <ankurp@nvidia.com>