[PROPOSAL] Add hostapd.conf parameter to skip check for neighboring BSS (prevent fallback in 150Mb mode)

[Valeriy Kucherenko]

The problem is that in my house about 12 access points that prevent me to enter 300Mb throughput mode because of check for neighboring BSSes. It would be very nice if I had the opportunity to skip this check by setting some configuration parametes (for ex. skip_interfere_bss_check=1). Currently I solving this by modifying hw_features.c and adding oper40=1 just before check if (!oper40) but I guess that this is not correct and the hostapd anyway sometimes falling back in 150Mb more again.

Thanks.