staging: i4l: act2000: remove unused argument

The macro EVAL_NCCI was only being used in capi.c and the argument
controller was not used. Remove the argument and at the same time
remove the variable which now becomes unused.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>