warp7: Fix DFU support

Currently DFU is not working.

Adjust CONFIG_SYS_MALLOC_LEN and dfu_alt_info so that we are
able to flash u-boot.imx into the eMMC via dfu using the
following method:

=> dfu 0 mmc 0

In the host PC:

dfu-util -D u-boot.imx -a boot

This is the same approach done in the mx6sl warp board.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>

include/configs/warp7.h

@@ -16,7 +16,7 @@
 #define CONFIG_MXC_UART_BASE		UART1_IPS_BASE_ADDR
 
 /* Size of malloc() pool */
-#define CONFIG_SYS_MALLOC_LEN		(32 * SZ_1M)
+#define CONFIG_SYS_MALLOC_LEN		(35 * SZ_1M)
 
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_BOARD_LATE_INIT
@@ -28,10 +28,7 @@
 #define CONFIG_SYS_MMC_IMG_LOAD_PART	1
 
 #define CONFIG_DFU_ENV_SETTINGS \
-	"dfu_alt_info=image raw 0 0x800000;"\
-		"u-boot raw 0 0x4000;"\
-		"bootimg part 0 1;"\
-		"rootfs part 0 2\0" \
+	"dfu_alt_info=boot raw 0x2 0x400 mmcpart 1\0" \
 
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	CONFIG_DFU_ENV_SETTINGS \