rtl8211f gigabit phy

Hi all,

rtl8211f phy is a popular a gigabit ethernet phy used in arm sbcs
it supports both rgmii and rgmii_id variants (full, tx, rx)
when the gmac node uses it in rgmii mode and the gmac driver sets the tx/rx delays and it works
when the gmac node declares the phy mode as rmgii-id it won't work because the phy code won't set the delays

patch for rgephy to work in rgmii_id mode and rx/tx variants
tested on radxa zero 3e

in rgmii-id mode without the patch tx worked very bad (2mb/s) in 1000fdx (worked ok in 100fdx)
forcing the gmac node to rgmii and using default delays worked without the patch


patch is for 14.3-R but should work on newer versions too