libpdbg/p8chip.c: release special wakeups for P8
libpdbg/p8chip.c: release special wakeups for P8

This copies the special wakeup release logic from p9chip.c

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

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