msi: Create MsiConfig to embed MsiCap

The same way we have MsixConfig in charge of managing whatever relates
to MSI-X vectors, we need a MsiConfig structure to manage MSI vectors.
The MsiCap structure is still needed as a low level API, but it is now
part of the MsiConfig which oversees anything related to MSI.

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

pci/src/lib.rs

@@ -25,7 +25,7 @@ pub use self::device::{
     BarReprogrammingParams, DeviceRelocation, Error as PciDeviceError, InterruptDelivery,
     InterruptParameters, PciDevice,
 };
-pub use self::msi::MsiCap;
+pub use self::msi::{MsiCap, MsiConfig};
 pub use self::msix::{MsixCap, MsixConfig, MsixTableEntry, MSIX_TABLE_ENTRY_SIZE};
 use kvm_bindings::{kvm_irq_routing, kvm_irq_routing_entry};
 use kvm_ioctls::*;