Wifi: Update AP Bands to include 6GHz

This commit updates the frequency bands to include 6GHz band.
The bands are represented as bitmask to allow combination of them.

Bug: 139354972
Test: atest com.android.wifi.server
Change-Id: Ib9c2cfa0f29489ca8e94c8e60f87a929cfea9158
4 files changed