Handle non-dtrace-triggered kernel breakpoint traps in mips.

[jhb]

Summary

If DTRACE is enabled at compile time, all kernel breakpoint traps are
first given to dtrace to see if they are triggered by a FBT probe.
Previously if dtrace didn't recognize the trap, it was silently
ignored breaking the handling of other kernel breakpoint traps such as
the debug.kdb.enter sysctl. This only returns early from the trap
handler if dtrace recognizes the trap and handles it.

Submitted by: Nicolò Mazzucato <[e-mail]>
Obtained from: CheriBSD

Test Plan

• has been in cheribsd for 3 weeks now

[jhb]

This is similar to D24018 but for MIPS instead of RISC-V.