Bug fix of HE cap parsing for HE device capability

1) Bug fix of parsing nl80211_band_iftype_attr as an array of nested
attribute instead of a nested attribute.
2) Relax HE PHY cap size check for some old Linux kernels which have the
incorrect HE PHY cap size of 9 (the correct size is 11).

Bug: 158795970
Test: manual test with 11ax device
Test: wificond unit test
Change-Id: I4e7c1716acf4ab6888fa25415fa79358260c95b0
3 files changed