staging: unisys: fix CamelCase names in struct channel_header

Fix CamelCase names:
Signature => signature
LegacySignature => legacy_signature
HeaderSize => header_size
Size => size
Features => features
Type => chtype
PartitionHandle => partition_handle
Handle => handle
oChannelSpace => ch_space_offset
VersionId => version_id
PartitionIndex => partition_index
ZoneGuid => zone_uuid
oClientString => cli_str_offset
CliStateBoot => cli_state_boot
CmdStateCli => cmd_state_cli
CliStateOs => cli_state_os
ChannelCharacteristics => ch_characteristic
CmdStateSrv => cmd_state_srv
srvState => srv_state
CliErrorBoot => cli_error_boot
CliErrorOs => cli_error_os
Filler => filler
RecoverChannel => recover_channel

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