Update CAM CCB accounting for the new status quo.

devq_openings counter lost its meaning after allocation queues has gone.
held counter is still meaningful, but problematic to update due to separate
locking of CCB allocation and queuing.

To fix that replace devq_openings counter with allocated counter.  held is
now calculated on request as difference between number of allocated, queued
and active CCBs.

MFC after:	1 month


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271588 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f