video: omap: split the legacy code from the DM code

The schedule for deprecating the features of the pre-driver-model puts
2019.17 as the deadline for the video subsystem. Furthermore, the latest
patches applied to the am335x-fb.c module have decreased the amount of
code shared with the pre-driver-model implementation. Splitting the two
implementations into two modules improves the readability of the code
and will make it easier to drop the pre-driver-model code.
I have not created a header file with the data structures and the
constants for accessing the LCD controller registers, but I preferred to
keep them inside the two c modules. This is a code replication until the
pre-driver-model version is dropped.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
diff --git a/drivers/video/tilcdc-panel.h b/drivers/video/tilcdc-panel.h
index 6b40731..6bcfbf8 100644
--- a/drivers/video/tilcdc-panel.h
+++ b/drivers/video/tilcdc-panel.h
@@ -6,7 +6,7 @@
 #ifndef _TILCDC_PANEL_H
 #define _TILCDC_PANEL_H
 
-#include "am335x-fb.h"
+#include "tilcdc.h"
 
 int tilcdc_panel_get_display_info(struct udevice *dev,
 				  struct tilcdc_panel_info *info);