drm: panel: simple: specify bpc for powertip_ph800480t013_idf02

Specify bpc value for the powertip_ph800480t013_idf02 panel to stop drm
code from complaining about unexpected bpc value (0).
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230727172445.1548834-1-dmitry.baryshkov@linaro.org

drivers/gpu/drm/panel/panel-simple.c

@@ -3205,6 +3205,7 @@ static const struct drm_display_mode powertip_ph800480t013_idf02_mode = {
 static const struct panel_desc powertip_ph800480t013_idf02  = {
 	.modes = &powertip_ph800480t013_idf02_mode,
 	.num_modes = 1,
+	.bpc = 8,
 	.size = {
 		.width = 152,
 		.height = 91,