refactor: get_prop(bpfdomain, bpf_progs_loaded_prop)

Based on:
  cs/p:aosp-master -file:prebuilts/ get_prop.*bpf_progs_loaded_prop

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: If07026b1ea5753a82401a62349c494b4cbf699b6
diff --git a/private/bpfdomain.te b/private/bpfdomain.te
index ada65ae..7c8f5c0 100644
--- a/private/bpfdomain.te
+++ b/private/bpfdomain.te
@@ -19,3 +19,7 @@
 # so let's allow all bpffs_type's instead,
 # this will keep things working even if this is fixed.
 allow bpfdomain bpffs_type:lnk_file read;
+
+# Needed for //frameworks/libs/net:
+# common/native/bpf_headers/include/bpf/WaitForProgsLoaded.h
+get_prop(bpfdomain, bpf_progs_loaded_prop)