Allow P2P CSA from 5GHz to 2.4GHz band

IEEE80211-2020 specification section 11.8.8 doesn't
restrict switching to a channel which is not in the
same band as current band. But at the same time, there
are some issues in switching between the 2.4/5 GHz bands
and the 6 GHz band. So limit the check to consider
the critical use case of switching from 5GHz channel to
2.4GHz channel.

Bug: 207671411
Test: Manual - Establish WFD connection in 5GHz. Update the regulatory
      information by marking all the 5GHz channels as NO_IR. Verified
      that P2P GO is able to move to 2.4GHz channel
Change-Id: I50ed32d7e11e6e0d2e6d56b34ce3b325fd1956f2
1 file changed