1. copy recipes-alexa to meta-cmf-raspberrypi or to a similar OEM layer
2. Add above 2 recipes to the appropriate package-group
3. bitbake rdk-generic-wpe-thunder (or the image where alexa is packaged)

$ vi Alexa_SDK/Integration/AlexaClientSDKConfig.json
     "deviceInfo":{
        // Unique device serial number. e.g. 123456
        "deviceSerialNumber":"<SERIAL_NO>",
        // The Client ID of the Product from developer.amazon.com
        "clientId":"<CLIENT_ID>",
        // Product ID from developer.amazon.com
        "productId":"<PRODUCT_ID>",
        // The name of the device manufacturer.
        "manufacturerName": "<MANUFACTURER_NAME>",
        // The description of the device which should contain the manufacturer name or how the device is connected.
        "description": "<DESCRIPTION"
    },

$ vi Alexa_SDK/Integration/AlexaCurl.json
Set below GPIO to appropriate value
   "PinOne":"115",
   "PinTwo":"122",
   "PinThree":"115"