workqueue: Remove deprecated system_nrt[_freezable]_wq

system_nrt[_freezable]_wq were deprecated by 3b07e9ca ("workqueue:
deprecate system_nrt[_freezable]_wq") and have been deprecated
for a long time. In addition, these are not used anymore. So,
let's remove these functions.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NTejun Heo <tj@kernel.org>

include/linux/workqueue.h

@@ -364,20 +364,6 @@ extern struct workqueue_struct *system_freezable_wq;
 extern struct workqueue_struct *system_power_efficient_wq;
 extern struct workqueue_struct *system_freezable_power_efficient_wq;
 
-static inline struct workqueue_struct * __deprecated __system_nrt_wq(void)
-{
-	return system_wq;
-}
-
-static inline struct workqueue_struct * __deprecated __system_nrt_freezable_wq(void)
-{
-	return system_freezable_wq;
-}
-
-/* equivlalent to system_wq and system_freezable_wq, deprecated */
-#define system_nrt_wq			__system_nrt_wq()
-#define system_nrt_freezable_wq		__system_nrt_freezable_wq()
-
 extern struct workqueue_struct *
 __alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
 	struct lock_class_key *key, const char *lock_name, ...) __printf(1, 6);