MT7622 (SoC) WMAC support

configname: CONFIG_MT7622_WMAC

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>MT7622 (SoC) WMAC support
In linux kernel since version 5.1 (release Date: 2019-05-05)  
This adds support for the built-in WMAC on MT7622 SoC devices
which has the same feature set as a MT7615, but limited to
2.4 GHz only.