staging: unisys: visorchannel: Rename CamelCase variable channelBytes

Rename channelBytes to channel_bytes in the series of visorchannel_create
functions provided by visorchannel.

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>