chardev: remove the headers of Memory chardev driver

Memory chardev driver is no longer used, and Commit:
4bf0bb8 has droped
it but the headers, so clean it up.

Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
Message-id: 1366188414-24214-1-git-send-email-lilei@linux.vnet.ibm.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

include/sysemu/char.h

@@ -289,12 +289,6 @@ CharDriverState *qemu_chr_open_eventfd(int eventfd);
 
 extern int term_escape_char;
 
-/* memory chardev */
-void qemu_chr_init_mem(CharDriverState *chr);
-void qemu_chr_close_mem(CharDriverState *chr);
-QString *qemu_chr_mem_to_qs(CharDriverState *chr);
-size_t qemu_chr_mem_osize(const CharDriverState *chr);
-
 CharDriverState *qemu_char_get_next_serial(void);
 
 /* msmouse */