i.MX: mxc_ipuv3_fb: add ipuv3_fb_shutdown() routine to stop IPU frame buffer

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Tested-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/include/ipu_pixfmt.h b/include/ipu_pixfmt.h
index 0019898..4baa711 100644
--- a/include/ipu_pixfmt.h
+++ b/include/ipu_pixfmt.h
@@ -77,5 +77,6 @@
 #define IPU_PIX_FMT_YUV422P fourcc('4', '2', '2', 'P')	/*< 16 YUV 4:2:2 */
 
 int ipuv3_fb_init(struct fb_videomode *mode, uint8_t disp, uint32_t pixfmt);
+void ipuv3_fb_shutdown(void);
 
 #endif