libpdbg/p9chip.c: use the OTR special wakeup status latch
libpdbg/p9chip.c: use the OTR special wakeup status latch

Use this to poll for special wakeup done (like skiboot does with
the HYP register).

Signed-off-by: Nicholas Piggin <24829078df5003d9dd1dd871ca2aeb0b1cf95ef4@gmail.com>

open-power/pdbg,open-power/pdbg,open-power/pdbg