Sergey Matyukevich 43736cf03f stm32/f0: RTC clock helpers
Add three more RTC clock helper functions:

- rcc_set_rtc_clock_source
  RTC on stm32/f0 can be clocked from the following three
  sources: LSI, LSE (32.768Hz), HSE/32.

- rcc_enable_rtc_clock
- rcc_disable_rtc_clock
  enable/disable clocking RTC module using selected clock source

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
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