From the validate docs in include/linux/phylink.h:
When state->interface is PHY_INTERFACE_MODE_NA, phylink expects the
MAC driver to return all supported link modes.
Tested-by: Birger Koblitz <mail@birger-koblitz.de>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
(cherry picked from commit 785d830e88)