use a second map for SingleWriterBpfMap test am: 45e9372733 am: db5021c1a6

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

Change-Id: I235a290f6ddb2d4a9ac66b3a9ba762d48039d716
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>