Merge branch 'Update-license-and-polish-ENA-driver-code'

Shay Agroskin says:

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Update license and polish ENA driver code

This series adds the following:
- Change driver's license into SPDX format
- Capitalize all log prints in ENA driver
- Fix issues raised by static checkers
- Improve code readability by adding functions, fix spelling
  mistakes etc.
- Update driver's documentation

Changed from previous version:
v1->v2: dropped patch that transforms pr_* log prints into dev_* prints
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Signed-off-by: David S. Miller <davem@davemloft.net>