ARM, locking/atomics: Implement _relaxed variants of atomic[64]_{inc,dec}

Now that the core code supports acquire/release/relaxed versions of
the atomic_inc family, implement only the _relaxed flavours in the ARM
backend so that we get all of the others for free.

Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Davidlohr Bueso <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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