move net_shared bpf programs into net_shared subdirectory

(no selinux consequences to this in and of itself,
 though required for follow up selinux changes)

Test: TreeHugger, manual
Bug: 218408035
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Id5ef7f3b119743ef26b062068756c4e0f754e694
diff --git a/bpfloader/BpfLoader.cpp b/bpfloader/BpfLoader.cpp
index 74ecfbc..8b49cec 100644
--- a/bpfloader/BpfLoader.cpp
+++ b/bpfloader/BpfLoader.cpp
@@ -77,7 +77,7 @@
         // Tethering mainline module: netd, clatd, ...etc
         {
                 .dir = "/apex/com.android.tethering/etc/bpf/net_shared/",
-                .prefix = "",
+                .prefix = "net_shared/",
         },
         // Core operating system
         {