p2p: avoid adding duplicate channel lists

Currently 6Ghz channels are categorized to IEEE80211A mode,
this will result in duplicate channel lists on adding
channels to the list.

Just add bands and the callee will check the band support.

Bug: 234000772
Test: atest vts
Change-Id: I4185ad15bfa06dd41765d9fe5f159ad0d9e5f017
1 file changed