flash: stm32: add support for STM32F0 flash controller

Add the STM32F0 Embedded Flash support in the flash_stm32 driver
interface.
The STM32F0 has a particularity or use the HSI as clock source
for the flash controller interface, so this clock must be
enabled directly in the case HSE or another clock is used by
the system clock.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
5 files changed