[SCSI] aacraid: Fix read capacity 16 return data

Received from Mark Salyzyn.

The return data from a read capacity 16 needs to have RTO_EN and PROT_EN
zeroed out.

Signed-off-by: Mark Haverkamp <markh@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>