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/board/freescale/mx51evk/mx51evk.c b/board/freescale/mx51evk/mx51evk.c
index bc7f057..514a7ac 100644
--- a/board/freescale/mx51evk/mx51evk.c
+++ b/board/freescale/mx51evk/mx51evk.c
@@ -502,7 +502,7 @@
 
 void lcd_enable(void)
 {
-	int ret = mx51_fb_init(&claa_wvga, 1, IPU_PIX_FMT_RGB565);
+	int ret = ipuv3_fb_init(&claa_wvga, 1, IPU_PIX_FMT_RGB565);
 	if (ret)
 		printf("LCD cannot be configured: %d\n", ret);
 }