iw: util: factor out HE capability parser

We're going to use this for scan parsing.

Signed-off-by: Brian Norris <briannorris@chromium.org>
Link: https://lore.kernel.org/r/20201118033936.3667788-3-briannorris@chromium.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1 file changed