drm: remove deprecated "drm_framebuffer_[un]reference" functions

There are no more places where this (deprecated) function is being used
from, thus it can now be removed.
Signed-off-by: Fernando Ramos <greenfoo@gluegarage.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20181115221634.22715-8-greenfoo@gluegarage.com

include/drm/drm_framebuffer.h

@@ -240,30 +240,6 @@ static inline void drm_framebuffer_put(struct drm_framebuffer *fb)
 	drm_mode_object_put(&fb->base);
 }
 
-/**
- * drm_framebuffer_reference - acquire a framebuffer reference
- * @fb: DRM framebuffer
- *
- * This is a compatibility alias for drm_framebuffer_get() and should not be
- * used by new code.
- */
-static inline void drm_framebuffer_reference(struct drm_framebuffer *fb)
-{
-	drm_framebuffer_get(fb);
-}
-
-/**
- * drm_framebuffer_unreference - release a framebuffer reference
- * @fb: DRM framebuffer
- *
- * This is a compatibility alias for drm_framebuffer_put() and should not be
- * used by new code.
- */
-static inline void drm_framebuffer_unreference(struct drm_framebuffer *fb)
-{
-	drm_framebuffer_put(fb);
-}
-
 /**
  * drm_framebuffer_read_refcount - read the framebuffer reference count.
  * @fb: framebuffer