net: Add mask for Control register 10Mbps speed

This patch adds mask for the Control register
10Mbps speed.
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/mii.h

@@ -48,6 +48,7 @@
 #define BMCR_SPEED100		0x2000	/* Select 100Mbps              */
 #define BMCR_LOOPBACK		0x4000	/* TXD loopback bits           */
 #define BMCR_RESET		0x8000	/* Reset to default state      */
+#define BMCR_SPEED10		0x0000	/* Select 10Mbps               */
 
 /* Basic mode status register. */
 #define BMSR_ERCAP		0x0001	/* Ext-reg capability          */