staging: unisys: visorbus: remove g_devicechangestate_packet

This patch removes the unused
struct controlvm_message_packet g_devicechangestate_packet.
The struct is set but never called.

Signed-off-by: Jon Frisch <jon.frisch@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>