Various fixes to hptmv(4):

• Replace the global driver lock with a per-instance device lock.
• Use the per-instance device lock instead of Giant for the CAM sim lock.
• Add global locks to protect the adapter list and DPC queues.
• Use wakeup() and mtx_sleep() to wait for certain events like the controller going idle rather than polling via timeouts passed to tsleep().
• Use callout(9) instead of timeout(9).
• Mark the interrupt handler MPSAFE.
• Remove compat shims for FreeBSD versions older than 8.0.

Reviewed by: Steve Chang <ychang@highpoint-tech.com>