[PEPC] Add command line switch that disables pepc disable logic

Bug: 1462930
Change-Id: I5296811dd978ca0d86321745b6b220161ec830f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5300968


Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Nicolas Dossou-Gbété <dgn@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1267467}