BpfLoader: adjust for change to bpf_map_def.h location am: 1b44455113

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/3236279

Change-Id: I317dba79af94e7aab24cd4cfce24d05bdc0c9067
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>