disp: msm: sde: correct num_datapath during PM resume with CWB

In PM resume with CWB concurrency usecase, crtc pointer in
conn->state is NULL since drm_mode_config_reset operation is
performed on pm_resume. This change relies on conn_mask in
new_crtc_state for primary connector retrieval and also adds
get_num_lm_from_mode callback to DSI for LM count retrieval
from dsi panel topology. Existing get_mode_info api cannot
retrieve the topology info because mode->priv_info is NULL.
This occurs as WB encoder is added in the drm encoder_list
before primary encoder, introduced as part of commit d28ebf05f4
("disp: msm: sde: populate WB display encoder list before dsi").

Change-Id: I55358fd88ab778bd81475cf3628be13335de1cb5
Signed-off-by: Jayaprakash Madisetty <jmadiset@codeaurora.org>
Signed-off-by: Samantha Tran <samtran@codeaurora.org>

msm/dsi/dsi_display.h

@@ -437,6 +437,15 @@ int dsi_display_get_qsync_min_fps(void *dsi_display, u32 mode_fps);
  */
 int dsi_display_get_avr_step_req_fps(void *dsi_display, u32 mode_fps);
 
+/*
+ * dsi_conn_get_lm_from_mode() - retrieves LM count from dsi mode priv info
+ * @display:            Handle to display.
+ * @mode:               Pointer to DRM mode structure
+ *
+ * Return: LM count from dsi panel topology
+ */
+int dsi_conn_get_lm_from_mode(void *dsi_display, const struct drm_display_mode *mode);
+
 /**
  * dsi_display_find_mode() - retrieve cached DSI mode given relevant params
  * @display:            Handle to display.