staging: comedi: adl_pci9118: rename interrupt_pci9118_ai_mode4_switch()

For aesthetics, remove "interrupt_" from this functions name to shorten
it a bit.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>