drm/i915/cnl: Symmetric scalers for each pipe

For Cannonlake the number of scalers for each pipe is 2. Let's increase
the number of scalers for pipe C.

v2: Use INTEL_GEN() instead of IS_CANNONLAKE()
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1509530930-24960-1-git-send-email-mika.kahola@intel.com

drivers/gpu/drm/i915/intel_device_info.c

@@ -347,7 +347,10 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
 	struct intel_device_info *info = mkwrite_device_info(dev_priv);
 	enum pipe pipe;
 
-	if (INTEL_GEN(dev_priv) >= 9) {
+	if (INTEL_GEN(dev_priv) >= 10) {
+		for_each_pipe(dev_priv, pipe)
+			info->num_scalers[pipe] = 2;
+	} else if (INTEL_GEN(dev_priv) == 9) {
 		info->num_scalers[PIPE_A] = 2;
 		info->num_scalers[PIPE_B] = 2;
 		info->num_scalers[PIPE_C] = 1;