Adding a new target of HW development kit using [Samsung Exynos i S111](https://www.samsung.com/semiconductor/minisite/exynos/products/iot/exynos-i-s111/) module to Mbed-OS.
This will widen the HW choices of Mbed-OS enabled NB-IoT, GNSS and Security (eFuse, AES, SHA-2, PKA, Secure Storage, Security Sub-System, [PUF](https://en.wikipedia.org/wiki/Physical_unclonable_function)) modules.
Target Name: S5JS100
Co-authored-by: Ivan Galkin <ivan.galkin@samsung.com>
Co-authored-by: Seokwon Lee <swon.lee@samsung.com>
Co-authored-by: Zhizhe Zhu <zhizhe.zhu@samsung.com>
Co-authored-by: Xinyi Zhao <xinyi.zhao@samsung.com>