[Bug 255143] uslcom: Garbled output from Silicon Labs CP2102

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255143

            Bug ID: 255143
           Summary: uslcom: Garbled output from Silicon Labs CP2102
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: probono at puredarwin.org

ugen5.2: <Silicon Labs CP2102 USB to UART Bridge Controller> at usbus5
uslcom0 on uhub2
uslcom0: <CP2102 USB to UART Bridge Controller> on usbus5

sudo screen /dev/ttyU0 500000
results in garbled output on FreeBSD:

QJ`J!�F����@� �D�*#"�J��`��*�i����G���-���*�

Tested on FreeBSD 12.2-RELEASE r366954 GENERIC on an Intel CPU machine as well
as on FreeBSD 13.0 on a Raspberry Pi 3.

The same device on the same machines on the same USB ports with the same bit
rate works well when using Linux.

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