cam: Optimize write protection MODE SENSE in da(4).
Before this change on every open da(4) driver read all mode pages to use only one bit. It was done so to not depend on the list of pages supported by the disk. But I've found that at least for SATL of LSI/ Broadcom HBAs with WD HDDs Power Condition mode page reading may take significant amount of time, much more than any other mode page, that visibly increased disk retaste time by GEOM. Address that by using data returned by the first MODE SENSE request to limit the following ones to only one (the first for now) mode page. With the change simultaneous retaste of 39 SATA disks takes about 2.5s instead of more than 4s before, and I no longer see "dareprobe" status on GEOM event thread. MFC after: 2 weeks Sponsored by: iXsystems, Inc.