drm/i915: make intel_cpt_verify_modeset static

Only one caller. Also drop the intel_ prefix as is now customary for
platform specific and static functions.

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -3229,7 +3229,7 @@ prepare: /* separate function? */
 	return pll;
 }
 
-void intel_cpt_verify_modeset(struct drm_device *dev, int pipe)
+static void cpt_verify_modeset(struct drm_device *dev, int pipe)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int dslreg = PIPEDSL(pipe);
@@ -3334,7 +3334,7 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
 		encoder->enable(encoder);
 
 	if (HAS_PCH_CPT(dev))
-		intel_cpt_verify_modeset(dev, intel_crtc->pipe);
+		cpt_verify_modeset(dev, intel_crtc->pipe);
 
 	/*
 	 * There seems to be a race in PCH platform hw (at least on some

drivers/gpu/drm/i915/intel_drv.h

@@ -718,7 +718,6 @@ extern void assert_pipe(struct drm_i915_private *dev_priv, enum pipe pipe,
 extern void intel_init_clock_gating(struct drm_device *dev);
 extern void intel_write_eld(struct drm_encoder *encoder,
 			    struct drm_display_mode *mode);
-extern void intel_cpt_verify_modeset(struct drm_device *dev, int pipe);
 extern void intel_prepare_ddi(struct drm_device *dev);
 extern void hsw_fdi_link_train(struct drm_crtc *crtc);
 extern void intel_ddi_init(struct drm_device *dev, enum port port);