imx: add i.MX8MN PE property

i.MX8MN does not have LVTTL, it has a PE property

Signed-off-by: Peng Fan <peng.fan@nxp.com>

arch/arm/include/asm/mach-imx/iomux-v3.h

@@ -104,7 +104,7 @@ typedef u64 iomux_v3_cfg_t;
 #define PAD_CTL_ODE		(0x1 << 5)
 #define PAD_CTL_PUE		(0x1 << 6)
 #define PAD_CTL_HYS		(0x1 << 7)
-#if defined(CONFIG_IMX8MM)
+#if defined(CONFIG_IMX8MM) || defined(CONFIG_IMX8MN)
 #define PAD_CTL_PE		(0x1 << 8)
 #else
 #define PAD_CTL_LVTTL		(0x1 << 8)