Add support for kernel 4.14 to the mvebu target.
This also replaces the old sfp and phylink patches with new versions
from Russell's clearfog-4.13 branch
http://git.arm.linux.org.uk/cgit/linux-arm.git/log/?h=clearfog-4.13
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
