powerpc/64s/exception: machine check pseries should skip the late handler for kernel MCEs

The powernv machine check handler copes with taking a MCE from one of
three contexts, guest, kernel, and user. In each case the early
handler runs first on a special stack, then:

- The guest case branches to the KVM interrupt handler (via standard
  interrupt macros).
- The user case will run the "late" handler which is like a normal
  interrupt that runs in virtual mode and uses the regular kernel
  stack.
- The kernel case queues the event and schedules it for processing
  with irq work.

The last case is important, it must not enable virtual memory because
the MMU state may not be set up to deal with that (e.g., SLB might be
clear), it must not use the regular kernel stack for similar reasons
(e.g., might be in OPAL with OPAL stack in r1), and the kernel does
not expect anything to touch its stack if interrupts are disabled.

The pseries handler does not do this queueing, but instead it always
runs the late handler for host MCEs, which has some of the same
problems.

Now that pseries is using machine_check_events, change it to do the
same as powernv and queue events for kernel MCEs.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190802105709.27696-11-npiggin@gmail.com