MAINTAINERS: skip CCing netdev for Bluetooth patches

As requested by Marcel skip netdev for Bluetooth patches.
Bluetooth has its own mailing list and overloading netdev
leads to fewer people reading it.

Link: https://lore.kernel.org/netdev/639C8EA4-1F6E-42BE-8F04-E4A753A6EFFC@holtmann.org/
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230517014253.1233333-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: kuba-moo

MAINTAINERS

@@ -14632,6 +14632,7 @@ F:	include/uapi/linux/netdevice.h
 F:	lib/net_utils.c
 F:	lib/random32.c
 F:	net/
+X:	net/bluetooth/
 F:	tools/net/
 F:	tools/testing/selftests/net/