pstore/core: drop cmpxchg based updates

I have here a FPGA behind PCIe which exports SRAM which I use for
pstore. Now it seems that the FPGA no longer supports cmpxchg based
updates and writes back 0xff…ff and returns the same.  This leads to
crash during crash rendering pstore useless.
Since I doubt that there is much benefit from using cmpxchg() here, I am
dropping this atomic access and use the spinlock based version.

Cc: Anton Vorontsov <[email protected]>
Cc: Colin Cross <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Rabin Vincent <[email protected]>
Tested-by: Rabin Vincent <[email protected]>
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
[kees: remove "_locked" suffix since it's the only option now]
Signed-off-by: Kees Cook <[email protected]>
Cc: [email protected]

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