Replace msleep(x) with with msleep(OPAL_BUSY_DELAY_MS) to document
these sleeps are to wait for opal (firmware).
Signed-off-by: NDaniel Klamt <eleon@ele0n.de>
Signed-off-by: NBjoern Noetel <bjoern@br3ak3r.de>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>