drm: panel-simple: add missing bus flags for Tianma tm070jvhg[30/33]

The DE signal is active high on this display, fill in the missing
bus_flags. This aligns panel_desc with its display_timing.

Fixes: 9a2654c0 ("drm/panel: Add and fill drm_panel type field")
Fixes: b3bfcdf8

 ("drm/panel: simple: add Tianma TM070JVHG33")

Signed-off-by: Markus Niebel <Markus.Niebel@ew.tq-group.com>
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://lore.kernel.org/r/20231012084208.2731650-1-alexander.stein@ew.tq-group.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231012084208.2731650-1-alexander.stein@ew.tq-group.com