staging: unisys: refactor DEVICE_MAP

Get rid of the typedef for DEVICE_MAP and use struct device_map instead.
Fix CamelCase names.

DeviceChannelSize => device_channel_size
CA_Index => ca_index
Reserved => reserved
Reserved2 => reserved2

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