feat(stm32mp1-fdts): remove RTC clock configuration

RTC clock configuration is done now in OPTEE.
Note: The RTC clock source can only be configured once.
TF-A, configuring the RTC clock source will have no effect in OPTEE.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
Change-Id: I111ba96b27d0de0c45086ba8ef947dd2e6785672
3 files changed