Add payload linker namespace test

Bug: 261110181
Test: atest MicrodroidTestApp
Change-Id: Id95c91a1ac75f7df5ae6e38980c626f82cdf5248
diff --git a/tests/testapk/src/native/emptybinary.cpp b/tests/testapk/src/native/emptybinary.cpp
new file mode 100644
index 0000000..15f3f4d
--- /dev/null
+++ b/tests/testapk/src/native/emptybinary.cpp
@@ -0,0 +1 @@
+// a binary without AVmPayload_main