Merge branch 'stmmac-intel-Fixes-and-cleanups-after-dwmac-intel-split'

Andy Shevchenko says:

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stmmac: intel: Fixes and cleanups after dwmac-intel split

Seems the split of dwmac-intel didn't go well and on top of that new
functionality in the driver has not been properly tested.

Patch 1 fixes a nasty kernel crash due to missed error handling.
Patches 2 and 3 fix the incorrect split (clock and PCI bar handling).

Patch 4 converts driver to use new PCI IRQ allocation API.

The rest is a set of clean ups that may have been done in the initial
submission.

Series has been tested on couple of Elkhart Lake platforms with different
behaviour of ethernet hardware.

Changelog v3:
- added the cover letter (David)
- appended separate fix as a first patch
- marked patches 2 and 3 with Fixes tag
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Signed-off-by: David S. Miller <davem@davemloft.net>