staging: vt6656: replace custom BOOL definition with bool

Checkpatch findings were not resolved, just make direct replacement
plus a couple of conflicting types in declarations.

sed -i 's/\bBOOL\b/bool/g' drivers/staging/vt6656/*.[ch]

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