drivers: net: cpsw-phy-sel: add dra7xx support for phy sel

Add dra7xx support for selecting the phy mode which is present in control
module of dra7xx SoC

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc Documentation/devicetree/bindings/net/cpsw-phy-sel.txt
Simple merge

diff --cc drivers/net/ethernet/ti/cpsw-phy-sel.c
Simple merge