zfs: cancel TRIM or initialize on FAULTED non-writeable vdevs

zfs: cancel TRIM or initialize on FAULTED non-writeable vdevs

From the openzfs commit message:
  When a device which is actively trimming or initializing becomes
  FAULTED, and therefore no longer writable, cancel the active
  TRIM or initialization.  When the device is merely taken offline
  with `zpool offline` then stop the operation but do not cancel it.
  When the device is brought back online the operation will be
  resumed if possible.

Obtained from:	openzfs/zfs@bedbc13daa6dfe9e0221bfadb8d8db2378deaacc
Approved by:	re (delphij)

(cherry picked from commit dc2743434f6cc73ca8ec1d551aba03a678eac804)