staging: unisys: refactor TASK_MGMT_TYPES

Get rid of the typedef and use enum task_mgmt_types in its place. Clean up
the indentation of the enumeration values and update all use of the name to
the new name.

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