Include bpf program in APEXes

bpf program is put to an APEX via 'bpfs' property. It is
placed under etc/bpf directory in it.

Fix: 167530625
Test: m
Change-Id: Ia36b486f0cffb619ecc4f7a318cde881abc5baf4
diff --git a/bpf/bpf_test.go b/bpf/bpf_test.go
index eeca057..d06d7d1 100644
--- a/bpf/bpf_test.go
+++ b/bpf/bpf_test.go
@@ -59,7 +59,7 @@
 
 func testContext(config android.Config) *android.TestContext {
 	ctx := cc.CreateTestContext()
-	ctx.RegisterModuleType("bpf", bpfFactory)
+	ctx.RegisterModuleType("bpf", BpfFactory)
 	ctx.Register(config)
 
 	return ctx