serial: icom: remove ICOM_VERSION_STR macro

It's unused, so remove the macro.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220421085808.24152-2-jslaby@suse.czSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/icom.c

@@ -46,7 +46,6 @@
 /*#define ICOM_TRACE		 enable port trace capabilities */
 
 #define ICOM_DRIVER_NAME "icom"
-#define ICOM_VERSION_STR "1.3.1"
 #define NR_PORTS	       128
 #define ICOM_PORT ((struct icom_port *)port)
 #define to_icom_adapter(d) container_of(d, struct icom_adapter, kref)