sys/fuchsia: fix task syscalls.

This commit fixes two issues related to the task syscalls.

The zx_task_resume syscall has been recently removed from zircon[0]. It
has been deprecated for some time already. This commit removes the
syscall.

The `ZX_EXCEPTION_PORT_UNBIND_QUIETLY` option for the syscall
`zx_task_bind_exception_port` has been removed recently as well[1]. This
commit removes that option from tasks.txt.

To test this change, I followed the procedure for building syzkaller for
fuchsia:

```shell
$ make extract TARGETOS=fuchsia SOURCEDIR=${FUCHSIADIR}
$ make generate
$ make TARGETOS=fuchsia TARGETARCH=amd64 SOURCEDIR=${FUCHSIADIR}
```

I excluded the changes from make extract. This commit only has the
generated files from make generate.

[0]: https://fuchsia-review.googlesource.com/c/zircon/+/228712
[1]: https://fuchsia-review.googlesource.com/c/zircon/+/228658

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