net: phy: Remove unused including <linux/version.h>

Eliminate the follow versioncheck warning:

./drivers/net/phy/mxl-gpy.c: 9 linux/version.h not needed.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: chongjiapeng <jiapeng.chong@linux.alibaba.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mxl-gpy.c

@@ -6,7 +6,6 @@
  *
  */
 
-#include <linux/version.h>
 #include <linux/module.h>
 #include <linux/bitfield.h>
 #include <linux/phy.h>