Add vendor command QCA_NL80211_VENDOR_SUBCMD_AVOID_FREQUENCY_EXT
and attribute qca_wlan_vendor_attr_avoid_frequency_ext to send structured
avoid frequency data.
This new command is alternative to existing command
QCA_NL80211_VENDOR_SUBCMD_AVOID_FREQUENCY since existing command is
using stream of bytes instead of structured data using vendor attributes.
Change-Id: I20c4836f9dd36f2e11e70a5b892db469a14c3746
CRs-Fixed: 2533156
90f0c5ed06