dt-bindings: net: s32cc-dwmac: add SGMII properties

commit 2373b8ad5dc8d99090b3c886c2938438783eef5c from
https://github.com/nxp-auto-linux/linux



Added properties in bindings for SGMII support. Added also missing
properties.

Issue: ALB-11126

Signed-off-by: Andrei Botila <andrei.botila@nxp.com>
Signed-off-by: Zhantao Tang <zhantao.tang@windriver.com>