tpm: Add OWNERS file

This CL is populating OWNERS file based on the candidates in the Chrome OS OWNERS status sheet.

BUG=b:132095048
TEST=None

Change-Id: Ifc176a941401f2cbc5512007496711b9ff037217
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/tpm/+/1682819