staging: unisys: Remove VISORCHANNEL typedef

Remove the VISORCHANNEL typedef and rename the base VISORCHANNEL_Tag
structure to visorchannel to follow consistent naming. The longer
struct visorchannel type required additional line wrapping to remain
less than 81 characters.

Signed-off-by: Bryan Thompson <bryan.thompson@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>