drivers/clock_control: stm32: Configure MCO1 on STM32F1

MCO1 is also available on STM32F1 series (on top of STM32F4), allow
selection of MCO1 source with CLOCK_STM32_MCO1_SRC_* Kconfig parameters.
Available MCO1 sources are slightly different between STM32F4
(LSE, HSE, HSI, PLLCLK) and STM32F103 (HSE, HSI, PLLCLK/2, SYSCLK), and
STM32F105/F107 have a few more (EXT_HSE, PLL2CLK, PLLI2SCLK, PLLI2SCLK/2).
MCO1 on STM32F1 does not have a configurable divider (unlike STM32F4),
HAL call only configures source.
STM32F1 do not have MCO2.

Signed-off-by: Pierre-Emmanuel Novac <piernov@piernov.org>