serial: sandbox: support Unicode
Due to a conversion error the sandbox does not accept byte values 0x80-0xff from the keyboard. The UEFI extended text input unit test requires Unicode support. Use unsigned char for the serial buffer. Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
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