pstore: enhancement for pstore write interface

[Chen Gong]

[PATCH 1/2] pstore: change the purpose of return value for pstore
[PATCH 2/2] pstore: update the policy of the UEFI-based backend

These two patches are for pstore write interface enhancement.
The 1st one updates the original write interface to return a valid
write result. The 2nd one updates the UEFI-based pstore backend
write policy. For the 2nd one, though Matthew current design is to
reduce UEFI variable space usage, but I think it is still too strict
as a log storage. :-)
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