ARM: imx: mach-imx6ul: add imx6ull support

imx6ull is derived SoC from imx6ul.
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/mach-imx/mach-imx6ul.c

@@ -89,6 +89,7 @@ static void __init imx6ul_init_late(void)
 
 static const char * const imx6ul_dt_compat[] __initconst = {
 	"fsl,imx6ul",
+	"fsl,imx6ull",
 	NULL,
 };