Remove microdroid_payload.json

The file was the input to make the payload.img. Instead using the
hard-coded file, let the test make it from the vm_config file in the
test APK. This will eventually be done by the client-side library, but
since we don't have it, let the test do it.

Bug: 185891097
Test: atest MicrodroidHostTestCases

Change-Id: I677dff58abb1b49d76b53c39ec33ccc0c8b88dc4
diff --git a/tests/testapk/src/native/testbinary.cpp b/tests/testapk/src/native/testbinary.cpp
index c317cd2..c3eefc4 100644
--- a/tests/testapk/src/native/testbinary.cpp
+++ b/tests/testapk/src/native/testbinary.cpp
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 #include <stdio.h>
+#include <sys/system_properties.h>
 
 extern "C" int android_native_main(int argc, char* argv[]) {
     printf("Hello Microdroid ");
@@ -25,5 +26,7 @@
         }
     }
     printf("\n");
+
+    __system_property_set("debug.microdroid.app.run", "true");
     return 0;
 }