tty: serial: fix help message for SERIAL_CPM

Running checkpatch reported error extra whitespace at the
end of help message for SERIAL_CPM menu entry

Signed-off-by: Arturs Artamonovs <Arturs.Artamonovs@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: artursartamonovsadi

drivers/tty/serial/Kconfig

@@ -782,7 +782,7 @@ config SERIAL_CPM
 	depends on CPM2 || CPM1
 	select SERIAL_CORE
 	help
-	  This driver supports the SCC and SMC serial ports on Motorola 
+	  This driver supports the SCC and SMC serial ports on Motorola
 	  embedded PowerPC that contain a CPM1 (8xx) or CPM2 (8xxx)
 
 config SERIAL_CPM_CONSOLE