driver core: Export device_is_dependent() to modules

Export device_is_dependent() since the drm_kms_helper module is starting
to use it.

Signed-off-by: Liu Ying <victor.liu@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231127051414.3783108-2-victor.liu@nxp.com