xheart_splx() has to restore the interrupt mask even on secondary CPUs

because each core has a separate mask. Otherwise the IPI can be left
disabled accidentally on a non-primary CPU when the core uses the
rendezvous mutex:

1. splraise(IPL_IPI) soft-masks the IPI.

2. An IPI hits and the CPU enters the interrupt handler.

3. The handler hard-masks the IPI.

4. The interrupt is not processed because of the CPU's current IPL.
   The IPI is left hard-masked on leaving the handler.

5. splx(s) lowers the IPL below IPL_IPI. However, the interrupt's
   hardware mask is left unchanged because of the CPU_IS_PRIMARY()
   check in xheart_splx().

After this, the system will eventually hang because the CPU does not
respond to IPI requests of other cores.

While here, fix a similar situation with CIU interrupts on octeon.
This might save a few moments of debugging once non-primary CPUs are
allowed to process CIU interrupts.

ok miod@

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