[PATCH 12/22] loongarch: Consolidate atomic-machine.h and remove ununsed atomic macros

[Wilco Dijkstra]

Hi Adhemerval,
 
> These are already provided by the generic include/atomic.h and
> the resulting macros are not Linux specific.

LGTM.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>

Cheers,
Wilco