[Bluetooth] Move CRC table into RFCOMM core

This patch moves rfcomm_crc_table[] into the RFCOMM core, because there
is no need to keep it in a separate file.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/rfcomm.h

@@ -275,9 +275,6 @@ static inline void rfcomm_session_hold(struct rfcomm_session *s)
 	atomic_inc(&s->refcnt);
 }
 
-/* ---- RFCOMM chechsum ---- */
-extern u8 rfcomm_crc_table[];
-
 /* ---- RFCOMM sockets ---- */
 struct sockaddr_rc {
 	sa_family_t	rc_family;