BpfHandler.h - switch mStatsMapB from BpfMap to BpfMapRO am: 21ce721bc0

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2124488

Change-Id: I957fa351e053a37aedef397e849903ba482ac6a0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>