staging: comedi: amplc_pci230: remove 'inline'

Some functions in "amplc_pci230.c" are declared `inline`.  Remove the
`inline` specifiers and let the compiler do what it wants with them.

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