Cordio Link Layer port for Nordic platforms

To use this port amend your mbed_app.json file as following:

        "NRF52840_DK": {
            "target.features_add": ["BLE"],
            "target.extra_labels_add": ["CORDIO", "CORDIO_LL", "SOFTDEVICE_NONE", "NORDIC_CORDIO"],
            "target.extra_labels_remove": ["SOFTDEVICE_COMMON", "SOFTDEVICE_S140_FULL", "NORDIC_SOFTDEVICE"]
        },
        "NRF52_DK": {
            "target.features_add": ["BLE"],
            "target.extra_labels_add": ["CORDIO", "CORDIO_LL", "SOFTDEVICE_NONE", "NORDIC_CORDIO"],
            "target.extra_labels_remove": ["SOFTDEVICE_COMMON", "SOFTDEVICE_S132_FULL", "NORDIC_SOFTDEVICE"]
        }

Resources used:

• RADIO
• TIMER0
• PPI channels 14 and 15
• HF clock is enabled