staging: vt6656: replaced custom WORD definition with u16

Checkpatch findings were not resolved.

sed -i 's/\bWORD\b/u16/g' drivers/staging/vt6656/*.[ch]
sed -i 's/\bPWORD\b/u16 */g' drivers/staging/vt6656/*.[ch]

Signed-off-by: Andres More <more.andres@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>