Damien George 88564c1406 stm32/uart: Generalise UART source clock calculation for H5 and H7 MCUs.
This gets the calculation working properly for H5 MCUs, and fixes the
switch statement to switch on csel&7 instead of csel&3.

Signed-off-by: Damien George <damien@micropython.org>
2023-09-28 17:30:38 +10:00
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