imx: ventana: config: set MMC env Partition to 1

Partition 1 equates to EMMC boot0

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

include/configs/gw_ventana.h

@@ -237,6 +237,7 @@
 #endif
 #if defined(CONFIG_ENV_IS_IN_MMC)
   #define CONFIG_SYS_MMC_ENV_DEV         0
+  #define CONFIG_SYS_MMC_ENV_PART        1
   #define CONFIG_ENV_OFFSET              (709 * SZ_1K)
   #define CONFIG_ENV_SIZE                (128 * SZ_1K)
   #define CONFIG_ENV_OFFSET_REDUND       (CONFIG_ENV_OFFSET + (128 * SZ_1K))