i.MX: declare iomux_v3_cfg_t arrays as const

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
diff --git a/board/freescale/mx6qsabreauto/mx6qsabreauto.c b/board/freescale/mx6qsabreauto/mx6qsabreauto.c
index bd87901..9e3700e 100644
--- a/board/freescale/mx6qsabreauto/mx6qsabreauto.c
+++ b/board/freescale/mx6qsabreauto/mx6qsabreauto.c
@@ -53,12 +53,12 @@
 	return 0;
 }
 
-iomux_v3_cfg_t uart4_pads[] = {
+iomux_v3_cfg_t const uart4_pads[] = {
 	MX6Q_PAD_KEY_COL0__UART4_TXD | MUX_PAD_CTRL(UART_PAD_CTRL),
 	MX6Q_PAD_KEY_ROW0__UART4_RXD | MUX_PAD_CTRL(UART_PAD_CTRL),
 };
 
-iomux_v3_cfg_t enet_pads[] = {
+iomux_v3_cfg_t const enet_pads[] = {
 	MX6Q_PAD_KEY_COL1__ENET_MDIO		| MUX_PAD_CTRL(ENET_PAD_CTRL),
 	MX6Q_PAD_KEY_COL2__ENET_MDC		| MUX_PAD_CTRL(ENET_PAD_CTRL),
 	MX6Q_PAD_RGMII_TXC__ENET_RGMII_TXC	| MUX_PAD_CTRL(ENET_PAD_CTRL),
@@ -81,7 +81,7 @@
 	imx_iomux_v3_setup_multiple_pads(enet_pads, ARRAY_SIZE(enet_pads));
 }
 
-iomux_v3_cfg_t usdhc3_pads[] = {
+iomux_v3_cfg_t const usdhc3_pads[] = {
 	MX6Q_PAD_SD3_CLK__USDHC3_CLK	| MUX_PAD_CTRL(USDHC_PAD_CTRL),
 	MX6Q_PAD_SD3_CMD__USDHC3_CMD	| MUX_PAD_CTRL(USDHC_PAD_CTRL),
 	MX6Q_PAD_SD3_DAT0__USDHC3_DAT0	| MUX_PAD_CTRL(USDHC_PAD_CTRL),