imx: ventana: enable dm for MTD and NAND

Enable driver model for MTD and NAND support allowing us to remove
the iomux, init, and most of the static configuration.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/include/configs/gw_ventana.h b/include/configs/gw_ventana.h
index 1d68abd..5754b6a 100644
--- a/include/configs/gw_ventana.h
+++ b/include/configs/gw_ventana.h
@@ -35,18 +35,8 @@
 /* Serial */
 #define CONFIG_MXC_UART_BASE	       UART2_BASE
 
-#if !defined(CONFIG_SPI_FLASH) && defined(CONFIG_SPL_NAND_SUPPORT)
-/* Enable NAND support */
-#ifdef CONFIG_CMD_NAND
-  #define CONFIG_SYS_MAX_NAND_DEVICE	1
-  #define CONFIG_SYS_NAND_BASE		0x40000000
-  #define CONFIG_SYS_NAND_5_ADDR_CYCLE
-  #define CONFIG_SYS_NAND_ONFI_DETECTION
-
-  /* DMA stuff, needed for GPMI/MXS NAND support */
-#endif
-
-#endif /* CONFIG_SPI_FLASH */
+/* NAND */
+#define CONFIG_SYS_MAX_NAND_DEVICE	1
 
 /* I2C Configs */
 #define CONFIG_SYS_I2C