imx: mx7: implement reset_misc

We need to power down lcdif to make 'reset' can pass stress test.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/armv7/mx7/soc.c

@@ -441,3 +441,11 @@ void s_init(void)
 
 	return;
 }
+
+void reset_misc(void)
+{
+#ifdef CONFIG_VIDEO_MXS
+	lcdif_power_down();
+#endif
+}
+