Add reset-(de)assert-us to ethernet PHYs on Fortinet FortiGate 50E to
solve instability after HW resetting of PHYs. (ex.: restarting "network"
service, etc...)
Fixes: #13391
Fixes: 102dc5a625 ("mvebu: add support for Fortinet FortiGate 50E")
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
(cherry picked from commit 5c65224d8f5787f6bdfaec9547637f1f2f46354f)