oniro-wic: bump seco-intel-b68 rootfs size to 3G

This fixes oniro-image-[base, extra]-dev do_image_wic task.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

meta-oniro-core/conf/distro/include/oniro-wic.inc

@@ -13,7 +13,7 @@ BOOT_PARTITION_SIZE ?= "512M"
 # Root partitions
 # No label as default filesystem is squashfs.
 # The SECO B68 board pulls in almost half a Gigabyte worth of linux-firmware.
-ROOT_PARTITION_SIZE:seco-intel-b68 ?= "2G"
+ROOT_PARTITION_SIZE:seco-intel-b68 ?= "3G"
 ROOT_PARTITION_SIZE ?= "1G"
 ROOTA_PARTITION_SIZE = "${ROOT_PARTITION_SIZE}"
 ROOTB_PARTITION_SIZE = "${ROOT_PARTITION_SIZE}"