patrick a802f71908 esp32/uart: Use xtal as UART clock source on S3 and C3.
Change UART clock source on S3/C3 so the UART can operate when CPU
frequency is below 80MHz.  This allows the UART to remain operational when
using Dynamic Frequency Scaling (DFS).

Signed-off-by: Patrick Joy <patrick@joytech.com.au>
2023-05-22 10:11:24 +10:00
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