BpfHandler.h - switch mStatsMapB from BpfMap to BpfMapRO am: eb9b6fad4e am: a53565b4f3

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/18992475

Change-Id: I868fafe5396ac88f11abe1f2e13e94efa524a6af
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>