Merge branch 'macb-Update-ethernet-compatible-string-for-SiFive-FU540'

Yash Shah says:

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macb: Update ethernet compatible string for SiFive FU540

This patch series renames the compatible property to a more appropriate
string. The patchset is based on Linux-5.3-rc6 and tested on SiFive
Unleashed board

Change history:
Since v1:
- Dropped PATCH3 because it's already merged
- Change the reference url in the patch descriptions to point to a
  'lore.kernel.org' link instead of 'lkml.org'
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Signed-off-by: David S. Miller <davem@davemloft.net>