locking/mutex: Don't mark mutex_trylock_recursive() as deprecated, temporarily

Until the DRM drivers are fixed to not use mutex_trylock_recursive(),
allyes/modconfig builds will emit an API deprecation warning:

 drivers/gpu/drm/i915/i915_gem_shrinker.c: In function ‘i915_gem_shrinker_lock’:
 drivers/gpu/drm/i915/i915_gem_shrinker.c:230:2: warning: ‘mutex_trylock_recursive’ is deprecated [-Wdeprecated-declarations]
   switch (mutex_trylock_recursive(&dev->struct_mutex)) {
	    ^

Don't pollute the kernel log until the DRM code is fixed. Hopefully
the checkpatch warning is enough to keep people from using this new
API, and we'll be NAK-ing new users as well.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ding Tianhong <dingtianhong@huawei.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Jason Low <jason.low2@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@us.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Terry Rudd <terry.rudd@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Will Deacon <Will.Deacon@arm.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: NIngo Molnar <mingo@kernel.org>

include/linux/mutex.h

@@ -211,7 +211,7 @@ enum mutex_trylock_recursive_enum {
  *  MUTEX_TRYLOCK_SUCCESS   - lock acquired,
  *  MUTEX_TRYLOCK_RECURSIVE - we already owned the lock.
  */
-static inline __deprecated __must_check enum mutex_trylock_recursive_enum
+static inline /* __deprecated */ __must_check enum mutex_trylock_recursive_enum
 mutex_trylock_recursive(struct mutex *lock)
 {
 	if (unlikely(__mutex_owner(lock) == current))