Flag guard the code related to the vendor modules feature

The feature is guarded by the RELEASE_AVF_ENABLE_VENDOR_MODULES flag. On
the virtmgr side the flag-guard check is done in the create_vm_internal
function. On the vm binary side the related flags (--vendor, --kernel)
are only enabled if the RELEASE_AVF_ENABLE_VENDOR_MODULES flag is
enabled.

Additionally the vendor modules related tests in MicrodroidTests now run
conditionally depending on the result of the
`isFeatureEnabled(FEATURE_VENDOR_MODULES)` call.

Bug: 298007909
Test: atest MicrodroidTests
Change-Id: I1467194c802720601a10d0a760a8f1d7ce134037
diff --git a/vm/src/run.rs b/vm/src/run.rs
index fc8d7e0..1ba9dec 100644
--- a/vm/src/run.rs
+++ b/vm/src/run.rs
@@ -84,25 +84,25 @@
         )?;
     }
 
-    let storage = if let Some(path) = config.microdroid.storage {
+    let storage = if let Some(ref path) = config.microdroid.storage {
         if !path.exists() {
             command_create_partition(
                 service.as_ref(),
-                &path,
+                path,
                 config.microdroid.storage_size.unwrap_or(10 * 1024 * 1024),
                 PartitionType::ENCRYPTEDSTORE,
             )?;
         }
-        Some(open_parcel_file(&path, true)?)
+        Some(open_parcel_file(path, true)?)
     } else {
         None
     };
 
     let kernel =
-        config.microdroid.kernel.as_ref().map(|p| open_parcel_file(p, false)).transpose()?;
+        config.microdroid.kernel().as_ref().map(|p| open_parcel_file(p, false)).transpose()?;
 
     let vendor =
-        config.microdroid.vendor.as_ref().map(|p| open_parcel_file(p, false)).transpose()?;
+        config.microdroid.vendor().as_ref().map(|p| open_parcel_file(p, false)).transpose()?;
 
     let extra_idsig_files: Result<Vec<File>, _> =
         config.extra_idsigs.iter().map(File::open).collect();