Realtek Ethernet switch family support

configname: CONFIG_NET_DSA_REALTEK

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Distributed Switch Architecture drivers
└─>Realtek Ethernet switch family support
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
Select to enable support for Realtek Ethernet switch chips.