drivers/clock_control: stm32H7 AHB clock computation depends on core
On cortex M4, AHB clock is equal to SystemCoreClock
On Cortex M7, AHB clock is equal to SystemCoreClock/HPRE
By the way, D1CPRE is of no use when starting from SystemCoreColck.
Signed-off-by:
Alexandre Bourdiol <alexandre.bourdiol@st.com>
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