Bpfloader - minimal fs_bpf_loader support

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I8090de18b50a717f77d3fddab62a611888aa1521
diff --git a/libbpf_android/include/libbpf_android.h b/libbpf_android/include/libbpf_android.h
index 2218215..95e1f19 100644
--- a/libbpf_android/include/libbpf_android.h
+++ b/libbpf_android/include/libbpf_android.h
@@ -45,6 +45,7 @@
     netd_readonly,      // (T+) fs_bpf_netd_readonly /sys/fs/bpf/netd_readonly
     netd_shared,        // (T+) fs_bpf_netd_shared   /sys/fs/bpf/netd_shared
     vendor,             // (T+) fs_bpf_vendor        /sys/fs/bpf/vendor
+    loader,             // (U+) fs_bpf_loader        /sys/fs/bpf/loader
 };
 
 // Note: this does not include domain::unrecognized, but does include domain::unspecified
@@ -57,6 +58,7 @@
     domain::netd_readonly,
     domain::netd_shared,
     domain::vendor,
+    domain::loader,
 };
 
 static constexpr bool unrecognized(domain d) {