Remove support for command-line args

We no longer support passing string arguments to a VM. Any
customization needed can be done by having the host communicate with
the VM after it starts.

Also start adding a header to provide the entry-point prototype for
better safety.

Bug: 249064104
Bug: 243513572
Test: atest MicrodroidTests MicrodroidHostTestCases
Change-Id: I0a1775f3b6a0b11c71c4831f6c380d96bb637c00
diff --git a/launcher/Android.bp b/launcher/Android.bp
index 93cae96..123ec2e 100644
--- a/launcher/Android.bp
+++ b/launcher/Android.bp
@@ -9,4 +9,5 @@
         "libdl",
         "libdl_android",
     ],
+    header_libs: ["vm_payload_headers"],
 }