riscv/atomic.h : Deduplicate arch_atomic.*

Some functions use mostly the same asm for 32-bit and 64-bit versions.

Make a macro that is generic enough and avoid code duplication.

(This did not cause any change in generated asm)

Signed-off-by: Leonardo Bras <[email protected]>
Reviewed-by: Guo Ren <[email protected]>
Reviewed-by: Andrea Parri <[email protected]>
Tested-by: Guo Ren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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