imx: ventana: enable dm for SPI

Enable driver model for SPI which allows us to remove the iomux
and init.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/configs/gwventana_gw5904_defconfig b/configs/gwventana_gw5904_defconfig
index b6ef9e6..091bf30 100644
--- a/configs/gwventana_gw5904_defconfig
+++ b/configs/gwventana_gw5904_defconfig
@@ -100,6 +100,9 @@
 CONFIG_CONS_INDEX=2
 CONFIG_DM_SERIAL=y
 CONFIG_MXC_UART=y
+CONFIG_SPI=y
+CONFIG_DM_SPI=y
+CONFIG_MXC_SPI=y
 CONFIG_DM_THERMAL=y
 CONFIG_IMX_THERMAL=y
 CONFIG_USB=y