[LICENSE] updated licenses for files under both ASF + BSD 3-clause

[hongshanli23]

Description

This PR is for item 4 in #20475

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• Code is well-documented

Changes

• Removed ASF header for files with no significant code changes (FindJeMalloc.cmake, mkldnn_base-inl.h)
• Moved files under both ASF + BSD 3-clause to the correct section in LICENSE

[mxnet-bot]

Hey @hsl89 , Thanks for submitting the PR
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[TristonC]

@hsl89 , A side note: If you put x instead of Y in the Essentials and Changes' list (like [x]), it will show a check mark there.

[hongshanli23]

@hsl89 , A side note: If you put x instead of Y in the Essentials and Changes' list (like [x]), it will show a check mark there.

magic

[josephevans]

Also noticed that FindJeMalloc.cmake is failing the license check as well, since license_header.py doesn't recognize the Boost license. Can you also add this to the same whitelist?

[josephevans]

Thanks! LGTM!

[josephevans]

@hsl89 Can you please port this to v1.x and master branches? Thanks!