nitrogen6x: Fix the PAD settings for the ECSPI chipselect

ECSPI chipselect (MX6_PAD_EIM_D19__GPIO3_IO19) is used with GPIO functionality,
so it does not make sense to set its pad as SPI pin.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Tested-by: Eric Nelson <eric.nelson@boundarydevices.com>
Acked-by: Eric Nelson <eric.nelson@boundarydevices.com>

board/boundary/nitrogen6x/nitrogen6x.c

@@ -330,7 +330,7 @@ int board_mmc_init(bd_t *bis)
 #ifdef CONFIG_MXC_SPI
 iomux_v3_cfg_t const ecspi1_pads[] = {
 	/* SS1 */
-	MX6_PAD_EIM_D19__GPIO3_IO19   | MUX_PAD_CTRL(SPI_PAD_CTRL),
+	MX6_PAD_EIM_D19__GPIO3_IO19  | MUX_PAD_CTRL(NO_PAD_CTRL),
 	MX6_PAD_EIM_D17__ECSPI1_MISO | MUX_PAD_CTRL(SPI_PAD_CTRL),
 	MX6_PAD_EIM_D18__ECSPI1_MOSI | MUX_PAD_CTRL(SPI_PAD_CTRL),
 	MX6_PAD_EIM_D16__ECSPI1_SCLK | MUX_PAD_CTRL(SPI_PAD_CTRL),