staging: unisys: visorbus: Merge controlvm completion status to controlvmchannel

The completion status are valid only for the controlvm channel
so they should be moved into its header file.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <Timothy.Sell@unisys.com>
Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>