scsi: ufs: ufshpb: Add "cold" regions timer

In order not to hang on to "cold" regions, we inactivate a region that has
had no READ access for a predefined amount of time - READ_TO_MS. For that
purpose monitor the active regions list, polling it on every
POLLING_INTERVAL_MS. On timeout expiry add the region to the
"to-be-inactivated" list unless it is clean and did not exhaust its
READ_TO_EXPIRIES - another parameter.

None of this applies to pinned regions.

Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Daejun Park <[email protected]>
Signed-off-by: Avri Altman <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

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