Bug fix of 6GHz band channelization

Move up 6GHz band start and end frequencies by 10MHz per IEEE 802.11ax
draft 7.0 Annex E Table E-4.
Add the special case of 6G band channel 2.

Bug: 167426957
Test: atest android.net.wifi
Test: manual test with 6GHz capable STA and AP
Change-Id: I24c9c4d38c74681cd7318a9b052d9c2cd4ddf87f
Merged-In: I24c9c4d38c74681cd7318a9b052d9c2cd4ddf87f