QCA ath11k spectral scan support

configname: CONFIG_ATH11K_SPECTRAL

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>QCA ath11k spectral scan support
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Enable ath11k spectral scan support

Say Y to enable access to the FFT/spectral data via debugfs.