[Bug 212120] fix AM335x PRU driver

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212120

            Bug ID: 212120
           Summary: fix AM335x PRU driver
           Product: Base System
           Version: CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: embedded.xyz at gmail.com

Created attachment 174024
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=174024&action=edit
patch for ti_pruss.c

The interrupt-notification is done via kqueue. The filter-function
ti_pruss_kqfilter makes use of knlist_add(), which needs to be locked.

Panics the kernel with INVARIANTS enabled.

Patch attached.

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