console-server: introduce `struct console_server`

Lift `struct console_server` from `struct console`

struct console_server will enable obmc-console to support multiple
consoles in a single obmc-console-server in the future.

Currently the 'struct console_server' only supports one active console.

Change-Id: Icb22fb46f217b174f3bccc0a03485549d82d1d6b
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/console-server.h b/console-server.h
index ac827c8..1b7c15c 100644
--- a/console-server.h
+++ b/console-server.h
@@ -97,8 +97,7 @@
 	TTY_DEVICE_PTY,
 };
 
-/* Console server structure */
-struct console {
+struct console_server {
 	struct {
 		const char *kname;
 		char *dev;
@@ -115,6 +114,15 @@
 			} uart;
 		};
 	} tty;
+
+	struct console *active;
+};
+
+struct console {
+	// point back to the console server
+	// which we are a member of
+	struct console_server *server;
+
 	const char *console_id;
 
 	/* Socket name starts with null character hence we need length */
@@ -215,7 +223,7 @@
 				     ringbuffer_poll_fn_t poll_fn, void *data);
 
 /* Console server API */
-void tty_init_termios(struct console *console);
+void tty_init_termios(struct console_server *server);
 
 /* socket paths */
 ssize_t console_socket_path(socket_path_t path, const char *id);