tty: add SPDX identifiers to Kconfig and Makefiles

There were a few Kconfig and Makefiles under drivers/tty/ that were
missing a SPDX identifier.  Fix that up so that automated tools can
properly classify all kernel source files.

Cc: Jiri Slaby <jslaby@suse.com>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Acked-by: David Sterba <dsterba@suse.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/Kconfig

+# SPDX-License-Identifier: GPL-2.0
 config TTY
 	bool "Enable TTY" if EXPERT
 	default y

drivers/tty/hvc/Kconfig

+# SPDX-License-Identifier: GPL-2.0
 if TTY
 
 config HVC_DRIVER

drivers/tty/ipwireless/Makefile

+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for the IPWireless driver
 #

drivers/tty/serdev/Kconfig

+# SPDX-License-Identifier: GPL-2.0
 #
 # Serial bus device driver configuration
 #

drivers/tty/serdev/Makefile

+# SPDX-License-Identifier: GPL-2.0
 serdev-objs := core.o
 
 obj-$(CONFIG_SERIAL_DEV_BUS) += serdev.o

drivers/tty/serial/8250/Kconfig

+# SPDX-License-Identifier: GPL-2.0
 #
 # The 8250/16550 serial drivers.  You shouldn't be in this list unless
 # you somehow have an implicit or explicit dependency on SERIAL_8250.

drivers/tty/serial/Kconfig

+# SPDX-License-Identifier: GPL-2.0
 #
 # Serial device configuration
 #

drivers/tty/serial/cpm_uart/Makefile

+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for the Motorola 8xx FEC ethernet controller
 #

drivers/tty/serial/jsm/Makefile

+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for Jasmine adapter
 #