HC32: add UART3 and 4 support #27677
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Description
this PR adds support for using UART3 and UART4 on HC32-based boards, assuming the ports are defined in the pins header for the mainboard.
additionally, the USART3 RX/TX pin definitions for the Aquila V1.0.1 mainboard were removed, as the pins defined for those functions are not available on that board (the variant used on that board doesn't have those pins).
Requirements
HC32-based mainboard
Benefits
Allows using a total of 4 hardware serial ports from the current 2.
Useful for e.g. controlling stepper motors.
Configurations
N/A
Related Issues
N/A