skiboot: Add pflash fix

The skiboot-5.6.0 tag contains a bug that can cause corruption. This
patch is applied to skiboot master, but has not made it to a tag yet.

Change-Id: I8bacd8d8b6083be68a75c4885550204ef34bf363
Signed-off-by: Joel Stanley <joel@jms.id.au>
2 files changed