oniro-image-extra-dev: bump rootfs size

When building oniro-image-extra-dev the task do_image_wic returns an error
because the size of "/" is over the fixed size. This solves the issue.

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

meta-oniro-core/recipes-core/images/oniro-image-extra-dev.bb

@@ -14,4 +14,4 @@ IMAGE_INSTALL:append = "\
 EXTRA_IMAGE_FEATURES += "dev-pkgs dbg-pkgs src-pkgs tools-sdk tools-debug tools-profile"
 
 # With the EXTRA_IMAGE_FEATURES we need to bump the default size of the rootfs
-ROOT_PARTITION_SIZE = "2G"
+ROOT_PARTITION_SIZE = "2500M"