net: keystone_net: increase MDIO clock frequency

With MAC_PHY sgmii configuration, u-boot checks PHY link status before
sending each packet. Increasing MDIO frequency increases overall tftp
speed. We set it to maximum 2.5MHz.

Acked-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>

arch/arm/include/asm/ti-common/keystone_net.h

@@ -51,7 +51,7 @@
 /* MDIO module input frequency */
 #define EMAC_MDIO_BUS_FREQ		(clk_get_rate(pass_pll_clk))
 /* MDIO clock output frequency */
-#define EMAC_MDIO_CLOCK_FREQ		1000000                /* 1.0 MHz */
+#define EMAC_MDIO_CLOCK_FREQ		2500000	/* 2.5 MHz */
 
 /* MII Status Register */
 #define MII_STATUS_REG			1