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
diff --git a/bpfloader/Android.bp b/bpfloader/Android.bp
index 48189e0..eea547d 100644
--- a/bpfloader/Android.bp
+++ b/bpfloader/Android.bp
@@ -32,7 +32,7 @@
     clang: true,
     shared_libs: [
         "libcutils",
-        "libbpf",
+        "libbpf_android",
         "libbase",
         "liblog",
         "libnetdbpf",