Make ZFS use the physical sector size when computing initial ashift

[Dag-Erling Smørgrav]

The attached patch causes ZFS to base the minimum transfer size for a
new vdev on the GEOM provider's stripesize (physical sector size) rather
than sectorsize (logical sector size), provided that stripesize is a
power of two larger than sectorsize and smaller than or equal to
VDEV_PAD_SIZE.  This should eliminate the need for ivoras@'s gnop trick
when creating ZFS pools on Advanced Format drives.

DES
-- 
Dag-Erling Smørgrav - des at des.no

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