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For parts like the STM32F1 Connectivity Line (STM32F105xx, STM32F107xx), it is occasionally necessary to source SYSCLK via PLL2. This patch will add this support. - Add: `UTILS_GetPLL2OutputFrequency()` to calculate the output frequency of PLL2 - Add: `LL_PLL_ConfigSystemClock_PLL2()` to configure the system clock as sourced from HSE, via PLL2 and PLL1. - Add: Miscellaneous support definitions. Signed-off-by: Attie Grande <attie.grande@argentum-systems.co.uk>