Fixed bluetooth initialization crash on espressif esp32 boards.

[igadmg]

Tried to use ArduinoBLE on Espressif Esp32 -WROVER board and had a kernel panic and reboot loop on BLE initialization. It was crashing on esp_bt_controller_init(&bt_cfg); somehow.

That change fixes the issue. But now the bt mode is set through sdk config. But channel advertising seem to work. Not sure if HCI should be converted to esp sdk too.

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