Bump linux to 5.7rc3

[NathanTP]

In preparation for OpenSBI, we're bumping linux. The only significant change was to the icenet driver and the linux config management (the newer kernel is more sensitive). There were some other fixes and cleanup, mostly of stuff that got uncovered during testing.

[zhemao]

Shouldn't the argument just be jCfg and not jCfg('bin')?

[NathanTP]

fixed

[a0u]

Tested Linux boot from a fresh clone.

[a0u]

This is probably unrelated, but my attempt to run the full testsuite failed partway due to filesystem corruption, likely from an unclean shutdown.

Running: "e2fsck -f -p /home/centos/FireMarshal/images/smoke0.img" in /home/centos/FireMarshal/scripts
/home/centos/FireMarshal/images/smoke0.img: Inodes that were part of a corrupted orphan linked list found.

/home/centos/FireMarshal/images/smoke0.img: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
(i.e., without -a or -p options)
TaskError - taskid:/home/centos/FireMarshal/images/smoke0.img
PythonAction Error
Traceback (most recent call last):
  File "/home/centos/venv/lib64/python3.6/site-packages/doit/action.py", line 424, in execute
    returned_value = self.py_callable(*self.args, **kwargs)
  File "/home/centos/FireMarshal/wlutil/build.py", line 444, in makeImage
    resizeFS(config['img'], 0)
  File "/home/centos/FireMarshal/wlutil/wlutil.py", line 522, in resizeFS
    raise sp.CalledProcessError(ret, " ".join(chkfsCmd))
subprocess.CalledProcessError: Command 'e2fsck -f -p /home/centos/FireMarshal/images/smoke0.img' returned non-zero exit status 4.

[NathanTP]

Ya, that seems to happen sometimes. I'm not totally sure why. It's unrelated.