oniro-wic.inc: Bump rootfs size for B68

With the master/kirkstone update, the rootfs grew by around 0.5G.
Accomodate this growth for now in the wic configuration.

Signed-off-by: Andrei Gherzan <andrei.gherzan@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 ?= "1536M"
+ROOT_PARTITION_SIZE_seco-intel-b68 ?= "2G"
 ROOT_PARTITION_SIZE ?= "1G"
 ROOTA_PARTITION_SIZE = "${ROOT_PARTITION_SIZE}"
 ROOTB_PARTITION_SIZE = "${ROOT_PARTITION_SIZE}"