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
8 files changed