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Add SPL support and clock tree init to STM32MP13 RCC driver. This consists of two parts, make SCMI into an optional dependency and add clock tree initialization. The SCMI dependency is made optional first by registering the few core clock provided by SCMI clock as fixed clock, and second by letting the clock core parse out the clock configuration from SoC registers. The clock initialization code is derived from STM32MP15xx clock tree initialization code, which is almost identical, except for the use of new PLL2000 for PLL1 on STM32MP13xx . Signed-off-by: Marek Vasut <marek.vasut@mailbox.org>