uefi: pxe: use core::net-types in public API

Please note that some structs that are low-level types and
UEFI-facing still use EfiIpAddr instead. This includes for
example

```rust
/// This struct contains optional parameters for [`BaseCode::discover`].
///
/// Corresponds to the `EFI_PXE_BASE_CODE_DISCOVER_INFO` type in the C API.
#[repr(C)]
#[derive(Debug, Pointee)]
pub struct DiscoverInfo {
    use_m_cast: bool,
    use_b_cast: bool,
    use_u_cast: bool,
    must_use_list: bool,
    server_m_cast_ip: EfiIpAddr,
    ip_cnt: u16,
    srv_list: [Server],
}
```

Once #1642 is resolved,
this can be improved.

Author: phip1611

uefi-test-runner/src/proto/network/pxe.rs

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT OR Apache-2.0
 
-use uefi::proto::network::IpAddress;
+use core::net::{IpAddr, Ipv4Addr};
 use uefi::proto::network::pxe::{BaseCode, DhcpV4Packet, IpFilter, IpFilters, UdpOpFlags};
 use uefi::{CStr8, boot};
 
@@ -30,7 +30,7 @@ pub fn test() {
         info!("DHCP: Server IP: {:?}", dhcp_ack.bootp_si_addr);
         info!("DHCP: Client IP: {:?}", dhcp_ack.bootp_yi_addr);
 
-        let server_ip = IpAddress::new_v4(dhcp_ack.bootp_si_addr);
+        let server_ip = IpAddr::V4(Ipv4Addr::from(dhcp_ack.bootp_si_addr));
 
         const EXAMPLE_FILE_NAME: &[u8] = b"example-file.txt\0";
         const EXAMPLE_FILE_CONTENT: &[u8] = b"Hello world!";
@@ -77,9 +77,9 @@ pub fn test() {
         info!("Reading UDP packet from example service");
 
         // Used as buffers
-        let mut src_ip = IpAddress::new_v4([0; 4]);
+        let mut src_ip = IpAddr::V4(Ipv4Addr::from([0; 4]));
         let mut src_port = 0;
-        let mut dest_ip = IpAddress::new_v4([0; 4]);
+        let mut dest_ip = IpAddr::V4(Ipv4Addr::from([0; 4]));
         let mut dest_port = 0;
         let mut header = [0; 1];
         let mut received = [0; 4];