drm/i915: Make active_pipes check skl specific

Seems that only skl needs to have SAGV turned off
for multipipe scenarios, so lets do it this way.

If anything blows up - we can always revert this patch.

v2: Changed if condition to look better (Ville).

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
[vsyrjala: wrapped long line to appease checkpatch]
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200513093816.11466-4-stanislav.lisovskiy@intel.com
diff --git a/drivers/gpu/drm/i915/intel_pm.h b/drivers/gpu/drm/i915/intel_pm.h
index fd1dc42..614ac7f 100644
--- a/drivers/gpu/drm/i915/intel_pm.h
+++ b/drivers/gpu/drm/i915/intel_pm.h
@@ -42,7 +42,8 @@ void skl_pipe_wm_get_hw_state(struct intel_crtc *crtc,
 			      struct skl_pipe_wm *out);
 void g4x_wm_sanitize(struct drm_i915_private *dev_priv);
 void vlv_wm_sanitize(struct drm_i915_private *dev_priv);
-bool intel_can_enable_sagv(const struct intel_bw_state *bw_state);
+bool intel_can_enable_sagv(struct drm_i915_private *dev_priv,
+			   const struct intel_bw_state *bw_state);
 int intel_enable_sagv(struct drm_i915_private *dev_priv);
 int intel_disable_sagv(struct drm_i915_private *dev_priv);
 void intel_sagv_pre_plane_update(struct intel_atomic_state *state);