Add port channel enum values

The channel is based on Spicevmc which simply tunnels data between
client and server. A few messages have been added:

SPICE_MSG_PORT_INIT: Describes the port state and fqdn name, should be
sent only once when the client connects.

SPICE_MSG_PORT_EVENT: Server port event. SPICE_PORT_EVENT_OPENED and
SPICE_PORT_EVENT_CLOSED are typical values when the chardev is opened
or closed.

SPICE_MSGC_PORT_EVENT: Client port event.

(See related spice.proto change in spice-common)

spice/enums.h

@@ -375,6 +375,7 @@ enum {
     SPICE_CHANNEL_TUNNEL,
     SPICE_CHANNEL_SMARTCARD,
     SPICE_CHANNEL_USBREDIR,
+    SPICE_CHANNEL_PORT,
 
     SPICE_END_CHANNEL
 };
@@ -596,4 +597,17 @@ enum {
     SPICE_MSGC_END_SPICEVMC
 };
 
+enum {
+    SPICE_MSG_PORT_INIT = 201,
+    SPICE_MSG_PORT_EVENT,
+
+    SPICE_MSG_END_PORT
+};
+
+enum {
+    SPICE_MSGC_PORT_EVENT = 201,
+
+    SPICE_MSGC_END_PORT
+};
+
 #endif /* _H_SPICE_ENUMS */

spice/protocol.h

@@ -135,6 +135,12 @@ enum {
     SPICE_INPUTS_CAP_KEY_SCANCODE,
 };
 
+enum {
+    SPICE_PORT_EVENT_OPENED,
+    SPICE_PORT_EVENT_CLOSED,
+    SPICE_PORT_EVENT_BREAK,
+};
+
 #include <spice/end-packed.h>
 
 #endif /* _H_SPICE_PROTOCOL */