drm/sti: rename files and functions

replace all "sti_drm_" occurences by "sti_"

Signed-off-by: Vincent Abriou <vincent.abriou@st.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
diff --git a/drivers/gpu/drm/sti/sti_vid.c b/drivers/gpu/drm/sti/sti_vid.c
index b82a34f..1e7e1d7 100644
--- a/drivers/gpu/drm/sti/sti_vid.c
+++ b/drivers/gpu/drm/sti/sti_vid.c
@@ -6,7 +6,7 @@
 
 #include <drm/drmP.h>
 
-#include "sti_drm_plane.h"
+#include "sti_plane.h"
 #include "sti_vid.h"
 #include "sti_vtg.h"