fix typo in command value in drivers/net/phy/mdio-bitbang.

mdio-bitbang mentioned 10 for both read and write.
However mdio read opcode is 10 and write opcode is 01
Fixed comment.

Signed-off-by: Frans Meulenbroeks <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/phy/mdio-bitbang.c

···
 	for (i = 0; i < 32; i++)
 		mdiobb_send_bit(ctrl, 1);
 
-	/* send the start bit (01) and the read opcode (10) or write (10).
+	/* send the start bit (01) and the read opcode (10) or write (01).
 	   Clause 45 operation uses 00 for the start and 11, 10 for
 	   read/write */
 	mdiobb_send_bit(ctrl, 0);