libpdbg/p9chip.c: fix ram instruction status sequence
libpdbg/p9chip.c: fix ram instruction status sequence

This comes from the workbook. Without this, some types of mfspr
loops forever despite having completed with bit 1 status set.

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

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