[PATCH] libata CHS: LBA28/LBA48 optimization (revise #6)

     - add lba_28_ok() and lba_48_ok() to ata.h.
     - check ending block number instead of staring block number.
     - use lba_28_ok() for CHS range check
     - LBA28/LBA48 optimization

Suggested by Mark Lord and Alan Cox.

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
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Signed-off-by: Jeff Garzik <jgarzik@pobox.com>