1. add kconfig help for GPIO0 output mode 2. fix a bug when select gpio0 output mode and initialize psram 3. make default config to official development board 4. fix wrong LAN8720 register index
1. add kconfig help for GPIO0 output mode 2. fix a bug when select gpio0 output mode and initialize psram 3. make default config to official development board 4. fix wrong LAN8720 register index