Use libc::VMADDR_HOST_CID instead of custom consts

Test: builds
Change-Id: Ia13381b673a0c0c50daa80a5fb86bd6c6bd2aacd
diff --git a/virtualizationservice/Android.bp b/virtualizationservice/Android.bp
index 0551229..26d41c9 100644
--- a/virtualizationservice/Android.bp
+++ b/virtualizationservice/Android.bp
@@ -32,6 +32,7 @@
         "libcommand_fds",
         "libdisk",
         "liblazy_static",
+        "liblibc",
         "liblog_rust",
         "libmicrodroid_metadata",
         "libmicrodroid_payload_config",
diff --git a/virtualizationservice/src/aidl.rs b/virtualizationservice/src/aidl.rs
index 86b5d59..eb84b9d 100644
--- a/virtualizationservice/src/aidl.rs
+++ b/virtualizationservice/src/aidl.rs
@@ -55,6 +55,7 @@
     SpIBinder, Status, StatusCode, Strong, ThreadState,
 };
 use disk::QcowFile;
+use libc::VMADDR_CID_HOST;
 use log::{debug, error, info, warn};
 use microdroid_payload_config::{OsConfig, Task, TaskType, VmPayloadConfig};
 use rpcbinder::run_vsock_rpc_server_with_factory;
@@ -78,9 +79,6 @@
 /// Directory in which to write disk image files used while running VMs.
 pub const TEMPORARY_DIRECTORY: &str = "/data/misc/virtualizationservice";
 
-/// The CID representing the host VM
-const VMADDR_CID_HOST: u32 = 2;
-
 /// The size of zero.img.
 /// Gaps in composite disk images are filled with a shared zero.img.
 const ZERO_FILLER_SIZE: u64 = 4096;