Sending BIO_GETATTR to disks

[Andrew Turner]

While working on a NAND flash driver I noticed a BIO_GETATTR request
will not make it to the disk. It would be useful to support attributes
in a NAND layer, eg. to get the size of the OOB region.

I've attached a patch to pass the disk driver BIO_GETATTR when
the new DISKFLAG_CANGETATTR is set. When DISKFLAG_CANGETATTR is unset
it will act the same as currently and deliver ENOIOCTL.

Andrew
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