drm/gud: Add Raspberry Pi Pico ID

Add VID/PID for the Raspberry Pi Pico implementation.
Source: https://github.com/notro/gud-pico



Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Peter Stuge <peter@stuge.se>
Link: https://patchwork.freedesktop.org/patch/msgid/20210703141321.35494-1-noralf@tronnes.org