smsc95xx: Add maintainer

Add Microchip Linux Driver Support as maintainer
because this driver is maintaining by Microchip.

Signed-off-by: Woojung Huh <Woojung.huh@gmail.com>
Acked-by: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: David S. Miller <davem@davemloft.net>