ipmi: Reduce ipmi_queue_msg_sync() polling loop time to 10ms

On a plain boot, this reduces the time spent in OPAL by ~170ms on
p9dsu. This is due to hiomap (currently) using synchronous IPMI
messages.

It will also *significantly* reduce latency on runtime flash
operations, as we'll spend typically 10-20ms in OPAL rather than
100-200ms. It's not an ideal solution to that, but it's a quick
and obvious win for jitter.

Cc: stable
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

core/ipmi.c

@@ -179,7 +179,7 @@ void ipmi_queue_msg_sync(struct ipmi_msg *msg)
 	unlock(&sync_lock);
 
 	while (sync_msg == msg)
-		time_wait_ms(100);
+		time_wait_ms(10);
 }
 
 static void ipmi_read_event_complete(struct ipmi_msg *msg)