partitions: add ->set_capacity block device method

* Add ->set_capacity block device method and use it in rescan_partitions()
  to attempt enabling native capacity of the device upon detecting the
  partition which exceeds device capacity.

* Add GENHD_FL_NATIVE_CAPACITY flag to try limit attempts of enabling
  native capacity during partition scan.

Together with the consecutive patch implementing ->set_capacity method in
ide-gd device driver this allows automatic disabling of Host Protected Area
(HPA) if any partitions overlapping HPA are detected.

Cc: Robert Hancock <[email protected]>
Cc: Frans Pop <[email protected]>
Cc: "Andries E. Brouwer" <[email protected]>
Acked-by: Al Viro <[email protected]>
Emphatically-Acked-by: Alan Cox <[email protected]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[email protected]>

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