video: fsl_dcu_fb: refactor init functions

Move dcu-related code to fsl_dcu_probe_common, keep in video_hw_init()
only legacy video stack (filling GraphicPanel struct etc.).

Add wrappers for all init functions, that will let to provide
struct fb_info as an additional param (needed for further moving it from
the global scope to driver private data struct in DM converted driver).

Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
diff --git a/include/fsl_dcu_fb.h b/include/fsl_dcu_fb.h
index 2dd5f54..7a5347a 100644
--- a/include/fsl_dcu_fb.h
+++ b/include/fsl_dcu_fb.h
@@ -6,11 +6,17 @@
  */
 #include <linux/fb.h>
 
-int fsl_dcu_init(unsigned int xres, unsigned int yres,
+int fsl_dcu_init(struct fb_info *fbinfo,
+		 unsigned int xres,
+		 unsigned int yres,
 		 unsigned int pixel_format);
+
 int fsl_dcu_fixedfb_setup(void *blob);
 
 /* Prototypes for external board-specific functions */
-int platform_dcu_init(unsigned int xres, unsigned int yres,
-		      const char *port, struct fb_videomode *dcu_fb_videomode);
+int platform_dcu_init(struct fb_info *fbinfo,
+		      unsigned int xres,
+		      unsigned int yres,
+		      const char *port,
+		      struct fb_videomode *dcu_fb_videomode);
 unsigned int dcu_set_pixel_clock(unsigned int pixclock);