support ranges TRIM for libata

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This series implements rangeѕ discard for ATA SSDs.  Compared to the
initial NVMe support there are two things that complicate the ATA
support:

 - ATA only suports 16-bit long ranges
 - the whole mess of generating a SCSI command first and then
   translating it to an ATA one.

This series adds support for limited range size to the block layer,
and stops translating discard commands - instead we add a new
Vendor Specific SCSI command that contains the TRIM payload when
the device asks for it.



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