[PATCH] libata: clean up constants

* Reorder ATA_DFLAG_* such that feature flags determined by
  ata_dev_configure() are on lower bits.  Reserve lower eight bits
  for this purpose and allocate dynamic flags from bit 8.

* Reorder ATA_FLAG_* such that feature flags determined during driver
  initiailization are on bits 0:15, dynamic flags on 16:23 and LLDD
  specific flags on 24:31.

* Kill trailing white space and lower-case an one line comment for
  consistency.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>