[SCSI] megaraid_sas: fix extended timeout handling

Replace the eh_timed_out method usage with setting sdev->timeout in
slave_configure.  Also only use the extended timeout for raid volumes,
physical devices shouldn't need it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>