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.org


Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>