staging: unisys: refactor UltraDiagChannelProtocolGuid

Fix the CamelCase name:

UltraDiagChannelProtocolGuid => spar_diag_channel_protocol_uuid

Also, rename ULTRA_DIAG_CHANNEL_PROTOCOL_GUID to SPAR_DIAG_CHANNEL_PROTOCOL_UUID
to match the new variable name. Update all references to the changed names.

Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>