pumpkin: add boot_conf parameter to select fitImage conf

Signed-off-by: Fabien Parent <fparent@baylibre.com>
diff --git a/include/configs/pumpkin.h b/include/configs/pumpkin.h
index 97e7275..37efdd2 100644
--- a/include/configs/pumpkin.h
+++ b/include/configs/pumpkin.h
@@ -49,7 +49,7 @@
 		"run mmc_discover_partition;" \
 		"mmc read ${kerneladdr} ${kernel_part_addr} ${kernel_part_size};" \
 		"setenv bootargs ${bootargs} root=/dev/mmcblk${mmcdev}p${rootfs_partition} rootwait; " \
-		"bootm ${kerneladdr}; \0"
+		"bootm ${kerneladdr}${boot_conf}; \0"
 
 #define TFTPBOOT \
 	"tftpboot=" \