libpdbg/p9chip: fix ram_is_setup
libpdbg/p9chip: fix ram_is_setup

Commit b825a47717 removed ram_is_setup unintentionally. Add it back.

Ramming still doesn't really work because special wakeup release
between stop and ram commands causes quiesced state to be lost.

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

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