ltp: add memcg_regression test to stable

Bug: 122327977
Test: vts-tradefed run commandAndExit vts --skip-all-system-status-check
--skip-preconditions --skip-device-info --module VtsKernelLtp  -t
controllers.memcg_regression
Tested on pixel 1, 3, aosp_cf_x86_phone
Change-Id: Iafd8a7ad476dbb04c7c7b70a6c31ef2a0e905723
1 file changed