Add comments to explain the difference between offload.o and offload@mainline.o. am: 7738877dbb

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3205170

Change-Id: I43776feab2ae758859410bbb048ef28efc259939
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/bpf_progs/Android.bp b/bpf_progs/Android.bp
index ee413c5..f6717c5 100644
--- a/bpf_progs/Android.bp
+++ b/bpf_progs/Android.bp
@@ -75,24 +75,28 @@
     sub_dir: "net_shared",
 }
 
+// Ships to Android S, the bpfloader of which fails to parse BTF enabled .o's.
 bpf {
     name: "offload.o",
     srcs: ["offload.c"],
     btf: false,
 }
 
+// This version ships to Android T+ which uses mainline netbpfload.
 bpf {
     name: "offload@mainline.o",
     srcs: ["offload@mainline.c"],
     cflags: ["-DMAINLINE"],
 }
 
+// Ships to Android S, the bpfloader of which fails to parse BTF enabled .o's.
 bpf {
     name: "test.o",
     srcs: ["test.c"],
     btf: false,
 }
 
+// This version ships to Android T+ which uses mainline netbpfload.
 bpf {
     name: "test@mainline.o",
     srcs: ["test@mainline.c"],