Add azure-iot-sdk-c component

The Azure IOT Hub Device SDK allows C/C++ applications to communicate
easily with Azure IoT Hub, Azure IoT Central and to Azure IoT Device
Provisioning.

Add azure-sdk as separate SDK components. It could be a part of
network communication apps.
Azure-sdk component depends on others connectivity items: ip-network
and sockets.
Also CMSIS-RTOS API should be available for proper building.
Mbedtls libraries is also required for TLS communication
with Azure cloud.

Signed-off-by: Artur Tynecki <Artur.Tynecki@arm.com>