1. sleep: fix potential issue when PSRAM enable.
2. esp32c2: add multiphy support.
3. ftm: workaround for ftm with ps.
4. add regdomain max channel of ap.
5. update total scan time.
6. update min chan when country policy is auto.
7. check whether country schan and nchan is valid.
1. Fix not update phy according to country code.
2. Update regdomain max channel according to country info from nvs and or AP.
3. Change nvs default country from "CN" to "01".
4. Channel 14 is allowed only 11b mode.
5. Remove csa when switch channel from/to 14 channel.
6. Update phy mode nvs when softap channel from 14 to other.
7. Fix the bug that check whether channel parameter is valid.
chenjianxing