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 commit5c65224d8f)