mx5: Rename mx51_fb_init()

The ipuv3 driver is currently only used on mx51, but it can be extended to work
on mx53 and mx6 as well.

Rename mx51_fb_init(), so that it can be used by other SoCs.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Jason Liu <r64343@freescale.com>
diff --git a/drivers/video/mxc_ipuv3_fb.c b/drivers/video/mxc_ipuv3_fb.c
index 1bee54c..c38e22d 100644
--- a/drivers/video/mxc_ipuv3_fb.c
+++ b/drivers/video/mxc_ipuv3_fb.c
@@ -599,7 +599,7 @@
 	return;
 }
 
-int mx51_fb_init(struct fb_videomode *mode, uint8_t disp, uint32_t pixfmt)
+int ipuv3_fb_init(struct fb_videomode *mode, uint8_t disp, uint32_t pixfmt)
 {
 	gmode = mode;
 	gdisp = disp;