Add OWNERS entries for lgarron@ and palmer@ to own HSTS/HPKP preload list data files.
Add OWNERS entries for lgarron@ and palmer@ to own HSTS/HPKP preload list data files.

At the moment, I make most changes to these files (with agl@ as reviewer).

When agl@ leaves in a month or so, this will:
- Let me LGTM changes to these files by other people.
- Let palmer@ review my changes.

BUG=590107, 590388

Review URL: https://codereview.chromium.org/1735313003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#378051}

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