Send device-key header to register/update api

[amntoppo]

Issue:

• Device was sending 2 device-key from 2 different API:
  For Agent app: /loginv2 and register/update
  For SDK: register/client and register/update

Fix:

• We were earlier sending x-authorization which is not required in register/update.
• Changing this boolean will send device-key to the API
  connection.setRequestProperty(DEVICE_KEY_HEADER, userPreferences.getDeviceKeyString());