default or selected kernelversion does not have config value CONFIG_MT7986_WMAC.
Result is shown for kernelversion 6.9.9

MT7986 (SoC) WMAC support

configname: CONFIG_MT7986_WMAC

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>MT7986 (SoC) WMAC support
In linux kernel since version 5.2 (release Date: 2019-07-07)  
This adds support for the built-in WMAC on MT7986 SoC device
which has the same feature set as a MT7915, but enables 6E
support.

selects
CONFIG_REGMAP