Feedback on setting CONFIG_IEEE80211N=y on non-N devices

[Stephen Gutknecht hilltx]

Hello,

On OpenWRT users are starting to use N hardware more and more.  The
ath9k driver now supports hostapd for example.  Currently the default
compile OpenWRT uses is to have hostapd with CONFIG_IEEE80211N=n which
limits these devices to 54Mbps rate.

Anyone have feedback or recommendations on changing compile option to
CONFIG_IEEE80211N=y for all builds?  is it likely to cause problems,
compatibility issues with non-N devices?

Thank you