Rename libbpf to libbpf_android

Rename the bpf support library in android to libbpf_android to make
it compatible with external bcc project. Fix the Android.bp file to
prevent build break.

Bug: 112334572
Test: No build breakage.
Change-Id: I24ae8aaf8ca8afdded5e46d21f0deec68d6030da
6 files changed