workqueue, freezer: unify spelling of 'freeze' + 'able' to 'freezable'

workqueue, freezer: unify spelling of 'freeze' + 'able' to 'freezable'

There are two spellings in use for 'freeze' + 'able' - 'freezable' and
'freezeable'.  The former is the more prominent one.  The latter is
mostly used by workqueue and in a few other odd places.  Unify the
spelling to 'freezable'.

Signed-off-by: Tejun Heo <[email protected]>
Reported-by: Alan Stern <[email protected]>
Acked-by: "Rafael J. Wysocki" <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: Dmitry Torokhov <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Alex Dubov <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Steven Whitehouse <[email protected]>