fb: put framebuffer drivers back under the "frame buffer devices" menu

The config FB_PRE_INIT_FB entry in drivers/video/Kconfig pushes all entries
below it out of the menuconfig selection. Fix this.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/Kconfig

@@ -2121,7 +2121,7 @@ config FB_EP93XX
 
 config FB_PRE_INIT_FB
 	bool "Don't reinitialize, use bootloader's GDC/Display configuration"
-	depends on FB_MB862XX_LIME
+	depends on FB && FB_MB862XX_LIME
 	---help---
 	  Select this option if display contents should be inherited as set by
 	  the bootloader.