Update OWNERS files for tracing

This change removes cfijalkovich@ from the OWNERS file for
frameworks/base/services/core/java/com/android/server/tracing, and adds
kevinjeon@ + platform/external/perfetto:/OWNERS. kevinjeon@ is also
added to frameworks/base/core/java/android/tracing/OWNERS.

Test: N/A
Bug: 268085481
Change-Id: Ib1a24115bd9bf759a5b51589c6dd16e7e911e159