configstore: reduce restrictions in prctl()

Prevent configstore from crash-looping due to:
/vendor/bin/hw/android.hardware.configstore@1.0-service:
libminijail[22988]: blocked syscall: prctl

Bug: 68162846
Test: Launch photos.
Change-Id: I1593ea1e03ec5f688ec7311e586178f2f952fed9