drm/i915: rename intel_fb.c to intel_fbdev.c

This file is all about the legacy fbdev support. If we want to extract
framebuffer functions, we better put those into a separate file.

Also rename functions accordingly, only two have used the intel_fb_
prefix anyway.

Reviewed-by: Chon Ming Lee <chon.ming.lee@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 0f8402b..189257d 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -713,14 +713,14 @@
 void intel_dvo_init(struct drm_device *dev);
 
 
-/* legacy fbdev emulation in intel_fb.c */
+/* legacy fbdev emulation in intel_fbdev.c */
 #ifdef CONFIG_DRM_I915_FBDEV
 extern int intel_fbdev_init(struct drm_device *dev);
 extern void intel_fbdev_initial_config(struct drm_device *dev);
 extern void intel_fbdev_fini(struct drm_device *dev);
 extern void intel_fbdev_set_suspend(struct drm_device *dev, int state);
-extern void intel_fb_output_poll_changed(struct drm_device *dev);
-extern void intel_fb_restore_mode(struct drm_device *dev);
+extern void intel_fbdev_output_poll_changed(struct drm_device *dev);
+extern void intel_fbdev_restore_mode(struct drm_device *dev);
 #else
 static inline int intel_fbdev_init(struct drm_device *dev)
 {
@@ -739,7 +739,7 @@
 {
 }
 
-static inline void intel_fb_restore_mode(struct drm_device *dev)
+static inline void intel_fbdev_restore_mode(struct drm_device *dev)
 {
 }
 #endif