idr: remove dead code

idr: remove dead code

Remove no longer used deprecated code, and make local functions
static.

Signed-off-by: Stephen Hemminger <[email protected]>
Acked-by: Jean Delvare <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Cc: Jeff Layton <[email protected]>
Cc: Philipp Reisner <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: George Spelvin <[email protected]>
Cc: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>