arm: vf610: fix double iomux configuration for vf610twr board

Get rid of double VF610_PAD_DDR_A15__DDR_A_15 iomux configuration.
Signed-off-by: NMarcel Ziswiler <marcel@ziswiler.com>

board/freescale/vf610twr/vf610twr.c

@@ -30,7 +30,6 @@ DECLARE_GLOBAL_DATA_PTR;
 void setup_iomux_ddr(void)
 {
 	static const iomux_v3_cfg_t ddr_pads[] = {
-		VF610_PAD_DDR_A15__DDR_A_15,
 		VF610_PAD_DDR_A15__DDR_A_15,
 		VF610_PAD_DDR_A14__DDR_A_14,
 		VF610_PAD_DDR_A13__DDR_A_13,