staging: unisys: visorbus: simplify visorchannel_create_guts

Removing the two wrapper functions dealing with visorchannel_create() and
instead just always use a new version of visorchannel_create() with an
additional parameter.

Signed-off-by: Sameer Wadgaonkar <sameer.wadgaonkar@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>