can: remove "WITH Linux-syscall-note" from SPDX tag of C files

The "WITH Linux-syscall-note" exception is intended for UAPI headers.

See LICENSES/exceptions/Linux-syscall-note
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20200403073741.18352-1-masahiroy@kernel.orgAcked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

net/can/bcm.c

-// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
 /*
  * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content
  *

net/can/gw.c

-// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
 /* gw.c - CAN frame Gateway/Router/Bridge with netlink interface
  *
  * Copyright (c) 2019 Volkswagen Group Electronic Research

net/can/proc.c

-// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
 /*
  * proc.c - procfs support for Protocol family CAN core module
  *

net/can/raw.c

-// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
 /* raw.c - Raw sockets for protocol family CAN
  *
  * Copyright (c) 2002-2007 Volkswagen Group Electronic Research