video: fbdev: controlfb: remove obsolete module support

CONFIG_FB_CONTROL is bool, hence the Apple "control" frame buffer
driver cannot be built as a module.

Replace module_init() by device_initcall().
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200324134508.25120-4-b.zolnierkie@samsung.com

drivers/video/fbdev/controlfb.c

@@ -31,7 +31,6 @@
  *  more details.
  */
 
-#include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
@@ -198,28 +197,6 @@ static const struct fb_ops controlfb_ops = {
 
 /********************  The functions for controlfb_ops ********************/
 
-#ifdef MODULE
-MODULE_LICENSE("GPL");
-
-int init_module(void)
-{
-	struct device_node *dp;
-	int ret = -ENXIO;
-
-	dp = of_find_node_by_name(NULL, "control");
-	if (dp && !control_of_init(dp))
-		ret = 0;
-	of_node_put(dp);
-
-	return ret;
-}
-
-void cleanup_module(void)
-{
-	control_cleanup();
-}
-#endif
-
 /*
  * Checks a var structure
  */
@@ -612,7 +589,7 @@ static int __init control_init(void)
 	return ret;
 }
 
-module_init(control_init);
+device_initcall(control_init);
 
 /* Work out which banks of VRAM we have installed. */
 /* danj: I guess the card just ignores writes to nonexistant VRAM... */