serial: Update PNP IDs

Add new Wacom device IDs to the 8250_pnp serial driver, to support
autoconfig on some newer tablet PCs.  Also add a comment to clarify that
the FUJ02E6 device is a custom protocol, not a Wacom tablet.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alan Cox <alan@etchedpixels.co.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>