staging: unisys: visorbus: renamed #defines in vbuschannel.h to match driver namespace

Renamed #defines:
* SPAR_VBUS_CHANNEL_PROTOCOL_UUID to VISOR_VBUS_CHANNEL_UUID
* SPAR_VBUS_CHANNEL_PROTOCOL_SIGNATURE to
		VISOR_VBUS_CHANNEL_SIGNATURE
* SPAR_VBUS_CHANNEL_PROTOCOL_VERSIONID to
		VISOR_VBUS_CHANNEL_VERSIONID

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