stdio_dev.h: Drop the video section as it is unused

With tighter build flags the fact that this header referenced
uchar/ushort without including what typedefs it causes an error.  Rather
than add another include here, drop the section in question as it is
unused.

Reported-by: Peter Robinson <pbrobinson@gmail.com>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>