Squashed commit of the following:
arch/arm: Rename include/stm32f0l0 and src/stm32f0l0 to stm32f0l0g0.
Change all occurrences of lower-case stm32f0l0 to stm32f0l0g0.
Change all occurrences of upper-case STM32F0L0 to STM32F0L0G0.
Initial ADC support and some improvemnets for the STM32 M0
arch/arm/src/stm32f0l0/Kconfig: improvements
configs/b-l072z-lrwan1: add ADC example
Approved-by: Gregory Nutt <gnutt@nuttx.org>