video: Add i.MX23/28 framebuffer driver

changes since v2:

- use v3 and v4 for specifying the ip version instead of i.MX23/28.
  This is a better namespace when future versions are added.
- rename mach/fb.h to mach/mxsfb.h

changes since v1:
- Add a LCDC_ prefix to the register names.
- use set/clear registers where appropriate
- protect call to mxsfb_disable_controller() in mxsfb_remove()
  with a (host->enabled) as suggested by Lothar Wassmann

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Shawn Guo <shawn.guo@freescale.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: linux-fbdev@vger.kernel.org
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 8c8fabd..9a096ae 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -153,6 +153,7 @@
 obj-$(CONFIG_FB_BFIN_7393)        += bfin_adv7393fb.o
 obj-$(CONFIG_FB_MX3)		  += mx3fb.o
 obj-$(CONFIG_FB_DA8XX)		  += da8xx-fb.o
+obj-$(CONFIG_FB_MXS)		  += mxsfb.o
 
 # the test framebuffer is last
 obj-$(CONFIG_FB_VIRTUAL)          += vfb.o