chardev: move headers to include/chardev

So they are all in one place. The following patch will move serial &
parallel declarations to the respective headers.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

ui/console.c

@@ -27,7 +27,7 @@
 #include "hw/qdev-core.h"
 #include "qemu/timer.h"
 #include "qmp-commands.h"
-#include "sysemu/char.h"
+#include "chardev/char.h"
 #include "trace.h"
 #include "exec/memory.h"
 

ui/gtk.c

@@ -54,7 +54,7 @@
 #include "qmp-commands.h"
 #include "x_keymap.h"
 #include "keymaps.h"
-#include "sysemu/char.h"
+#include "chardev/char.h"
 #include "qom/object.h"
 
 #define MAX_VCS 10