vfio: Remove unused GSI routing functions

At this point, both MSI and MSI-X handle the KVM GSI routing update,
which means the vfio crate does not have to deal with it anymore.
Therefore, several functions can be removed from the vfio-pci code, as
they are not needed anymore.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

pci/src/msi.rs

@@ -159,7 +159,7 @@ impl MsiCap {
 }
 
 pub struct MsiConfig {
-    pub cap: MsiCap,
+    cap: MsiCap,
     pub irq_routes: Vec<InterruptRoute>,
     vm_fd: Arc<VmFd>,
     gsi_msi_routes: Arc<Mutex<HashMap<u32, kvm_irq_routing_entry>>>,
@@ -198,14 +198,6 @@ impl MsiConfig {
         self.cap.size()
     }
 
-    pub fn num_enabled_vectors(&self) -> usize {
-        self.cap.num_enabled_vectors()
-    }
-
-    pub fn vector_masked(&self, vector: usize) -> bool {
-        self.cap.vector_masked(vector)
-    }
-
     pub fn update(&mut self, offset: u64, data: &[u8]) {
         let old_enabled = self.cap.enabled();