comedi: remove unnecessary module_init/exit functions

comedi: remove unnecessary module_init/exit functions

Many Comedi drivers have unnecessary empty module_init and module_exit
functions. Remove them. Note that if a module_init function exists, a
module_exit function must also exist; otherwise, the module cannot be
unloaded.

Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Reviewed-by: Ian Abbott <abboti@mev.co.uk>
Link: https://patch.msgid.link/20260131013810.32265-1-enelsonmoore@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>