SecurityCoordinator: cleanup interface (part 2)

- low serialize of request parameters into kata_security_request
- add InstallRequest that passes the package buffer as an opaque ptr
- add EchoRequest for SecurityRequestEcho
- purge (now) unused SecurityRequestData type alias and hide
  SECURITY_REQUEST_DATA_SIZE (only used in crate)
- use &str instead of String in serialize requests (from mattharvey@)
- add SreSerializeFailed

Change-Id: Iac1930c0b2fead0f96b87da5d116280865031be2
GitOrigin-RevId: 37df6cd1969b3be2628e2e34f3de8fd129fdbc1b

apps/system/components/DebugConsole/kata-shell/src/lib.rs

@@ -128,12 +128,19 @@ fn echo_command(cmdline: &str, output: &mut dyn io::Write) -> Result<(), Command
 /// Implements an "scecho" command that sends arguments to the Security Core's echo service.
 fn scecho_command(cmdline: &str, output: &mut dyn io::Write) -> Result<(), CommandError> {
     use kata_security_interface::kata_security_request;
+    use kata_security_interface::EchoRequest;
     use kata_security_interface::SecurityRequest;
     use kata_security_interface::SECURITY_REPLY_DATA_SIZE;
 
     let (_, request) = cmdline.split_at(7); // 'scecho'
     let reply = &mut [0u8; SECURITY_REPLY_DATA_SIZE];
-    match kata_security_request(SecurityRequest::SrEcho, request.as_bytes(), reply) {
+    match kata_security_request(
+        SecurityRequest::SrEcho,
+        &EchoRequest {
+            value: request.as_bytes(),
+        },
+        reply,
+    ) {
         Ok(_) => {
             writeln!(
                 output,