riscv: dts: starfive: visionfive 2: Add configuration of gmac and phy
v1.3B:
v1.3B uses motorcomm YT8531(rgmii-id phy) x2, need delay and
inverse configurations.
The tx_clk of v1.3B uses an external clock and needs to be
switched to an external clock source.
v1.2A:
v1.2A gmac0 uses motorcomm YT8531(rgmii-id) PHY, and needs delay
configurations.
v1.2A gmac1 uses motorcomm YT8512(rmii) PHY, and needs to
switch rx and rx to external clock sources.
Signed-off-by: Samin Guo <samin.guo@starfivetech.com>
Tested-by: Tommaso Merciai <tomm.merciai@gmail.com>