clock_control: stm32_ll_clock: Enable MSI autocal when PLL source
clock_control: stm32_ll_clock: Enable MSI autocal when PLL source

Allow for the MSI to be auto-cal'd via an LSE when enabled, even when
being used as a source for the PLL as the sysclock.

Signed-off-by: Pushpal Sidhu <1bbf91bdb66f74b1ab0901158947c9d4636ee766@gmail.com>

Vudentz/zephyr,galak/zephyr,nashif/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,Vudentz/zephyr,nashif/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,Vudentz/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,Vudentz/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,ldts/zephyr,finikorg/zephyr,finikorg/zephyr,nashif/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr