pico-imx7d: Increase u-boot size for dfu request

After DM conversion, the size of U-Boot binary to increase.
Previous size is 480K after DM Conversion the new size is 557K
So it's necessary to increase the dfu request for store u-boot-dtb.img in eMMC.
Signed-off-by: NJoris Offouga <offougajoris@gmail.com>

include/configs/pico-imx7d.h

@@ -46,7 +46,7 @@
 #define CONFIG_DFU_ENV_SETTINGS \
 	"dfu_alt_info=" \
 		"spl raw 0x2 0x400;" \
-		"u-boot raw 0x8a 0x400;" \
+		"u-boot raw 0x8a 0x1000;" \
 		"/boot/zImage ext4 0 1;" \
 		"/boot/imx7d-pico-hobbit.dtb ext4 0 1;" \
 		"/boot/imx7d-pico-pi.dtb ext4 0 1;" \