cleanup: remove unused code from pci and vm-device crates

This is code we are not going to use in Firecracker. Remove it, so we
can keep the crates we vend as minimal as possible, including only
things we are actually using.

Signed-off-by: Babis Chalios <[email protected]>

Author: bchalios

src/pci/src/lib.rs

@@ -12,7 +12,6 @@ extern crate log;
 mod bus;
 mod configuration;
 mod device;
-mod msi;
 mod msix;
 
 use std::fmt::{self, Debug, Display};
@@ -31,7 +30,6 @@ pub use self::configuration::{
 pub use self::device::{
     BarReprogrammingParams, DeviceRelocation, Error as PciDeviceError, PciDevice,
 };
-pub use self::msi::{msi_num_enabled_vectors, MsiCap, MsiConfig};
 pub use self::msix::{
     Error as MsixError, MsixCap, MsixConfig, MsixConfigState, MsixTableEntry, MSIX_CONFIG_ID,
     MSIX_TABLE_ENTRY_SIZE,

src/pci/src/msi.rs

@@ -9,7 +9,6 @@
 use serde::{Deserialize, Serialize};
 
 mod bus;
-pub mod dma_mapping;
 pub mod interrupt;
 
 pub use self::bus::{Bus, BusDevice, BusDeviceSync, Error as BusError};