tty: serial: tegra: initialize with lower baudrate

While setup, there is a time the serial port is running on a
predefined speed (115200). When data arrived during this phase at
a lower baudrate (e.g. 9600), a lot of overrun and break error
messages were shown. Due to those messages, the terminal setup
never finished, and thus never reached the selected baudrate (e.g.
9600). By choosing a lower baudrate at the startup (9600), a lot
less (if any at all) messages are shown and those initialization
always succeeds.

Another solution would be to disable those messages completely.
However, while normal mode its good to have those UART error
messages.

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