Add a QCA vendor attribute to set avoid frequencies per netdev

Add a QCA vendor attribute to set avoid frequencies per netdev

Add a new attribute QCA_WLAN_VENDOR_ATTR_AVOID_FREQUENCY_IFINDEX
for QCA_NL80211_VENDOR_SUBCMD_AVOID_FREQUENCY_EXT subcommand to
apply rules for avoid frequencies on a specific netdev. This is a
32-bit unsigned optional attribute.

Signed-off-by: Purushottam Kushwaha <quic_pkushwah@quicinc.com>