[DISCO_L053C8] Added support for the STM32L0 Discovery board

Tested this with `workspace_tools\build.py -m DISCO_L053C8 -t GCC_ARM` and build was successful. I have included the drivers from STM32Cube_FW_L0_V1.1.0 whereas the Nucleo L053R8 is using STM32Cube_FW_L0_V1.0.0