omap1: Fix compile for omap1_bl.c

Commit 9905a43b made struct backlight_ops const. Omap was
setting check_fb dynamically, which caused the following
compile error:

drivers/video/backlight/omap1_bl.c: In function 'omapbl_probe':
drivers/video/backlight/omap1_bl.c:142: error: assignment of read-only variable 'omapbl_ops'

Turns out pdata->check_fb is not being used, so just remove
it to fix the compile.

Cc: Emese Revfy <re.emese@gmail.com>
Cc: Richard Purdie <rpurdie@linux.intel.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/include/plat/board.h

@@ -99,7 +99,6 @@ struct fb_info;
 struct omap_backlight_config {
 	int default_intensity;
 	int (*set_power)(struct device *dev, int state);
-	int (*check_fb)(struct fb_info *fb);
 };
 
 struct omap_fbmem_config {

drivers/video/backlight/omap1_bl.c

@@ -139,8 +139,6 @@ static int omapbl_probe(struct platform_device *pdev)
 	if (!pdata)
 		return -ENXIO;
 
-	omapbl_ops.check_fb = pdata->check_fb;
-
 	bl = kzalloc(sizeof(struct omap_backlight), GFP_KERNEL);
 	if (unlikely(!bl))
 		return -ENOMEM;