staging: comedi: ni_stc.h: tidy up 8255 register defines

Only the 'Port_A' define is used. Rename the CamelCase and remove the
unused defines.

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>

diff --cc drivers/staging/comedi/drivers/ni_mio_common.c
Simple merge

diff --cc drivers/staging/comedi/drivers/ni_stc.h
Simple merge