locking/atomic: openrisc: avoid asm-generic/atomic.h

OpenRISC is the only architecture which uses asm-generic/atomic.h and
also provides its own implementation of some functions, requiring
ifdeferry in the asm-generic header. As OpenRISC provides the vast
majority of functions itself, it would be simpler overall if it also
provided the few functions it cribs from asm-generic.

This patch decouples OpenRISC from asm-generic/atomic.h. Subsequent
patches will simplify the asm-generic implementation and remove the now
unnecessary ifdeferry.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <[email protected]>
Acked-by: Stafford Horne <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Jonas Bonn <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stefan Kristiansson <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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