Revert "Provide option to disable child memcg."

This reverts commit 128760363056775291a6ff4a4c332092ae123b3d.

Reason for revert: per_app_memcg property resolves this issue. Not needed.

CRs-Fixed: 2271707
Change-Id: I3f36f936e23aae0f8468f3fa25c9a7e1766c0780
1 file changed