disp: msm: dp: update resource tracking for 8k@30

Update tracking of layer mixer resources to prevent valid modes
from being skipped during DP topology validation.

Change-Id: Id88337094c4113b721f307d24583a3ca30157216
Signed-off-by: Nisarg Bhavsar <quic_bhavsar@quicinc.com>

msm/dp/dp_panel.h

@@ -78,6 +78,7 @@ struct dp_display_mode {
 	 * The output format can be read from drm_mode.
 	 */
 	enum dp_output_format output_format;
+	u32 lm_count;
 };
 
 struct dp_panel;