media: i2c: alvium: removal of dft_fr, min_fr and max_fr

media: i2c: alvium: removal of dft_fr, min_fr and max_fr

The dft_fr, min_fr and max_fr fields of the alvium_dev structure are
only used to pass results from alvium_get_frame_interval() to its
caller. Replace them with function parameters.

Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>