drm/<drivers>: Use drmm_add_final_kfree

drm/<drivers>: Use drmm_add_final_kfree

These are the leftover drivers that didn't have a ->release hook that
needed to be updated.

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: "James (Qian) Wang" <james.qian.wang@arm.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Mihail Atanassov <mihail.atanassov@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200323144950.3018436-19-daniel.vetter@ffwll.ch