use a second map for SingleWriterBpfMap test am: 45e9372733

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3134196

Change-Id: I1eb68c5ae1c49b4bc9832515df169e96c74dd4a7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>