Adapt to the latest Fuchsia images

[wangrunji0408]

It's been almost 2 years since the last update of Fuchsia images.
There are some unknown changes on the official Zircon kernel that causes zCore to fail on the latest Fuchsia image.

Here are the things we need to do:

1. Build the latest Fuchsia from source. See official docs.
2. Generate and extract files required by zCore. Refer to the old build script, this file also needs to be updated.
3. Run zCore with the new images, then you may get some errors.
4. Figure out what has changed and try to fix the problem.