Add new API functions to get/set configuration to Drv_Urt

There are customers who want to change the UART configuration during runtime (e.g. change baud rate).

Currently there is no function available for this use case.

A workaround could be to delete and create the UART driver object with a new configuration, but this causes a spike on the TX line (see issue SUP-26386).

So an IOCTRL or a Get/SetConfig for changing the UART configuration was requested.