BpfLoader: split bpffs subdir creation out

Needs to be before program loading, this should eventually allow loading programs in parallel.

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I95933a5ffbe2230c19d0f91c167e1256ea2f3713
diff --git a/loader/include/libbpf_android.h b/loader/include/libbpf_android.h
index fbdae6f..8e5a887 100644
--- a/loader/include/libbpf_android.h
+++ b/loader/include/libbpf_android.h
@@ -49,6 +49,7 @@
 
 // The C++ portion of the BpfLoader is exposed as 3 functions to be called in order.
 void initLogging();
+void createBpfFsSubDirectories();
 void legacyBpfLoader();
 __noreturn void execNetBpfLoadDone();