[PM] Add joenotcharles to owners

R=chrisha

Change-Id: If77da5ebdff20e663f1fe9e216a2b1a46dda56bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341345Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795541}

components/performance_manager/OWNERS

 chrisha@chromium.org
 fdoray@chromium.org
 siggi@chromium.org
+joenotcharles@google.com
 
 # For IPC security review
 per-file *.mojom=set noparent