net: dsa: microchip: ksz8: fix offset for the timestamp filed

We are using wrong offset, so we will get not a timestamp.

Fixes: 4b20a07e ("net: dsa: microchip: ksz8795: add support for ksz88xx chips")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/microchip/ksz_common.c

@@ -423,7 +423,7 @@ static u8 ksz8863_shifts[] = {
 	[DYNAMIC_MAC_ENTRIES_H]		= 8,
 	[DYNAMIC_MAC_ENTRIES]		= 24,
 	[DYNAMIC_MAC_FID]		= 16,
-	[DYNAMIC_MAC_TIMESTAMP]		= 24,
+	[DYNAMIC_MAC_TIMESTAMP]		= 22,
 	[DYNAMIC_MAC_SRC_PORT]		= 20,
 };