drm/i915: move i915_vgacntrl_reg() where needed

Reduce clutter from i915_drv.h.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/d30a79d008b875f708f5acf7924f9ca8ab06b575.1556809195.git.jani.nikula@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -3357,16 +3357,6 @@ extern void intel_display_print_error_state(struct drm_i915_error_state_buf *e,
 #define INTEL_BROADCAST_RGB_FULL 1
 #define INTEL_BROADCAST_RGB_LIMITED 2
 
-static inline i915_reg_t i915_vgacntrl_reg(struct drm_i915_private *dev_priv)
-{
-	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
-		return VLV_VGACNTRL;
-	else if (INTEL_GEN(dev_priv) >= 5)
-		return CPU_VGACNTRL;
-	else
-		return VGACNTRL;
-}
-
 static inline unsigned long msecs_to_jiffies_timeout(const unsigned int m)
 {
 	unsigned long j = msecs_to_jiffies(m);

drivers/gpu/drm/i915/intel_display.c

@@ -15486,6 +15486,16 @@ void intel_init_display_hooks(struct drm_i915_private *dev_priv)
 		dev_priv->display.update_crtcs = intel_update_crtcs;
 }
 
+static i915_reg_t i915_vgacntrl_reg(struct drm_i915_private *dev_priv)
+{
+	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
+		return VLV_VGACNTRL;
+	else if (INTEL_GEN(dev_priv) >= 5)
+		return CPU_VGACNTRL;
+	else
+		return VGACNTRL;
+}
+
 /* Disable the VGA plane that we never use */
 static void i915_disable_vga(struct drm_i915_private *dev_priv)
 {