net: mvpp2: Add phylink_validate support for dynamic changed phy_interface

commit 0c8856125f77f9330157bb111eb17b20289b4bd7 from
git@git.assembla.com:cavium/WindRiver.linux.git

Store fwnode_phy_mode and validate supported modes against them.
Ports with phy_interface 10GKR and 5GKR can support 2500baseX and 1000baseX
if port doesn't have phy.

Change-Id: I264e491f282399a586626fbc0116050ecdc5b12f
Signed-off-by: Stefan Chulski <stefanc@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/56072


Reviewed-by: Yan Markman <ymarkman@marvell.com>
(cherry picked from commit bab4b5c5ca722ae98b593e00d133a06c261c5469)
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/56127


Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>