Wrong dbM value in advertisement data when using C3/S3 chip.

[sanastasiou]

C3 and S3 have a workaround where different power levels could be set for e.g. advertising or scanning. The workaround does not take into account advertisement data, which keeps sending "default" channel with incorrect dbM value to the advertisement packet.

The fix should be backwards compatible since it only adds an optional parameter when Tx level is added into the advertisement packet.

Tested and verified that I now see -3 dbM when previously setting the Tx Level like this:

NimBLEDevice::setPowerLevel(ESP_PWR_LVL_N3, ESP_BLE_PWR_TYPE_ADV);

Without the fix some default value is transmitted.