net: mvpp2: Fix the periodic XON enable bit

This bit was originally wrong, the correct value is BIT(1), so fix it.
Signed-off-by: NMarcin Wojtas <mw@semihalf.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2.c

@@ -262,7 +262,7 @@
 #define      MVPP2_GMAC_MAX_RX_SIZE_MASK	0x7ffc
 #define      MVPP2_GMAC_MIB_CNTR_EN_MASK	BIT(15)
 #define MVPP2_GMAC_CTRL_1_REG			0x4
-#define      MVPP2_GMAC_PERIODIC_XON_EN_MASK	BIT(0)
+#define      MVPP2_GMAC_PERIODIC_XON_EN_MASK	BIT(1)
 #define      MVPP2_GMAC_GMII_LB_EN_MASK		BIT(5)
 #define      MVPP2_GMAC_PCS_LB_EN_BIT		6
 #define      MVPP2_GMAC_PCS_LB_EN_MASK		BIT(6)