Add an option to start a pVM without pvmfw

This can be useful when debugging issues related to early boot of pVMs.

Note: this option is only available for debugging and requires `adb
root`.

Bug: 376870129
Test: adb shell 'setprop hypervisor.pvmfw.path none
Test: adb shell /apex/com.android.virt/bin/vm run-microdroid -p
Change-Id: I61074fbec5df3dcd7b6273586f491c32d810cc70
diff --git a/android/virtmgr/src/crosvm.rs b/android/virtmgr/src/crosvm.rs
index b28834a..94379a9 100644
--- a/android/virtmgr/src/crosvm.rs
+++ b/android/virtmgr/src/crosvm.rs
@@ -975,7 +975,11 @@
     if config.protected {
         match system_properties::read(SYSPROP_CUSTOM_PVMFW_PATH)? {
             Some(pvmfw_path) if !pvmfw_path.is_empty() => {
-                command.arg("--protected-vm-with-firmware").arg(pvmfw_path)
+                if pvmfw_path == "none" {
+                    command.arg("--protected-vm-without-firmware")
+                } else {
+                    command.arg("--protected-vm-with-firmware").arg(pvmfw_path)
+                }
             }
             _ => command.arg("--protected-vm"),
         };