disp: msm: update topology based on clock requirement

Update the topology allocation by considering the required
mode clock (vtotal x htotal x fps * fudge factor). Modes with
a clock that exceeds the maximum SDE clock will be denoted as
requiring a topology that uses two layer mixers.

Change-Id: I3c773598b0d79cb6fea9d3a0e04d89ff84d67e13
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>

msm/msm_kms.h

@@ -122,6 +122,10 @@ struct msm_kms_funcs {
 	int (*cont_splash_config)(struct msm_kms *kms);
 	/* check for continuous splash status */
 	bool (*check_for_splash)(struct msm_kms *kms);
+	/* topology information */
+	int (*get_mixer_count)(const struct msm_kms *kms,
+			const struct drm_display_mode *mode,
+			const struct msm_resource_caps_info *res, u32 *num_lm);
 };
 
 struct msm_kms {