Register RKP HAL only when it is declared in VINTF

No need to register the hal unless it is declared in VINTF.

Test: Disable remote attestation and run an app with VM
to check there's no error for the registration.
Bug: 343576424

Change-Id: Ia5df43b2a15156976b68a09695e4e89dd8bc0710
diff --git a/virtualizationservice/src/aidl.rs b/virtualizationservice/src/aidl.rs
index 5e71245..8fe4167 100644
--- a/virtualizationservice/src/aidl.rs
+++ b/virtualizationservice/src/aidl.rs
@@ -346,7 +346,7 @@
             ))
             .with_log();
         }
-        if !remotely_provisioned_component_service_exists()? {
+        if !is_remote_provisioning_hal_declared()? {
             return Err(Status::new_exception_str(
                 ExceptionCode::UNSUPPORTED_OPERATION,
                 Some("AVF remotely provisioned component service is not declared"),
@@ -403,7 +403,7 @@
     }
 
     fn isRemoteAttestationSupported(&self) -> binder::Result<bool> {
-        remotely_provisioned_component_service_exists()
+        is_remote_provisioning_hal_declared()
     }
 
     fn getAssignableDevices(&self) -> binder::Result<Vec<AssignableDevice>> {
@@ -862,7 +862,9 @@
     Ok(())
 }
 
-fn remotely_provisioned_component_service_exists() -> binder::Result<bool> {
+/// Returns true if the AVF remotely provisioned component service is declared in the
+/// VINTF manifest.
+pub(crate) fn is_remote_provisioning_hal_declared() -> binder::Result<bool> {
     Ok(binder::is_declared(REMOTELY_PROVISIONED_COMPONENT_SERVICE_NAME)?)
 }