P2P: Use best-overall channel in p2p_reselect_channel()

P2P: Use best-overall channel in p2p_reselect_channel()

Commit 50285f5ca8086cca45afa42cd23c3a3c1cd58f40 ended up forcing channel
re-selection in number of cases where the peer would actually have
accepted our initial preference. Fix the parts related to best channel
information by using best_freq_overall as the highest priority and by
skipping the band changes if the peer supports the channel that we
picked since these were based on the assumption that
p2p_reselect_channel() is called only if the peer could not accept our
initial choice which is not the case anymore.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>