BpfLoadTest: Set rlimit memlock for old kernels am: bc4ae410ff

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/3034061

Change-Id: Ia835831979e537d2cdda260d101958196b9e6db3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>