drm/cirrus: removed optional dummy crtc mode_fixup function.

This patch set nukes all the dummy crtc mode_fixup implementations.
(made on top of Daniel topic/drm-misc branch)

Signed-off-by: Carlos Palminha <palminha@synopsys.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/5a3c41fed15847549f9bdeae89b72705b4756cc4.1455630967.git.palminha@synopsys.com

drivers/gpu/drm/cirrus/cirrus_mode.c

@@ -91,18 +91,6 @@ static void cirrus_crtc_dpms(struct drm_crtc *crtc, int mode)
 	WREG_GFX(0xe, gr0e);
 }
 
-/*
- * The core passes the desired mode to the CRTC code to see whether any
- * CRTC-specific modifications need to be made to it. We're in a position
- * to just pass that straight through, so this does nothing
- */
-static bool cirrus_crtc_mode_fixup(struct drm_crtc *crtc,
-				   const struct drm_display_mode *mode,
-				   struct drm_display_mode *adjusted_mode)
-{
-	return true;
-}
-
 static void cirrus_set_start_address(struct drm_crtc *crtc, unsigned offset)
 {
 	struct cirrus_device *cdev = crtc->dev->dev_private;
@@ -372,7 +360,6 @@ static const struct drm_crtc_funcs cirrus_crtc_funcs = {
 
 static const struct drm_crtc_helper_funcs cirrus_helper_funcs = {
 	.dpms = cirrus_crtc_dpms,
-	.mode_fixup = cirrus_crtc_mode_fixup,
 	.mode_set = cirrus_crtc_mode_set,
 	.mode_set_base = cirrus_crtc_mode_set_base,
 	.prepare = cirrus_crtc_prepare,