configs: pumpkin: use partition name instead of partition id

Signed-off-by: Fabien Parent <fparent@baylibre.com>
diff --git a/include/configs/pumpkin.h b/include/configs/pumpkin.h
index 37efdd2..85f55b7 100644
--- a/include/configs/pumpkin.h
+++ b/include/configs/pumpkin.h
@@ -39,11 +39,10 @@
 
 #define MMCBOOT \
 	"mmcdev=0\0" \
-	"kernel_partition=2\0" \
 	"rootfs_partition=3\0" \
 	"mmc_discover_partition=" \
-		"part start mmc ${mmcdev} ${kernel_partition} kernel_part_addr;" \
-		"part size mmc ${mmcdev} ${kernel_partition} kernel_part_size;\0" \
+		"part start mmc ${mmcdev} kernel kernel_part_addr;" \
+		"part size mmc ${mmcdev} kernel kernel_part_size;\0" \
 	"mmcboot=" \
 		"mmc dev ${mmcdev};" \
 		"run mmc_discover_partition;" \