staging: most: usb: Change '--help--' to 'help' in Kconfig

Change '--help--' in Kconfig file to silence checkpatch.pl warning:
WARNING: prefer 'help' over '---help---' for new help texts
Signed-off-by: Wentao Cai <etsai042@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/most/usb/Kconfig

@@ -5,7 +5,7 @@
 config MOST_USB
 	tristate "USB"
 	depends on USB && NET
-	---help---
+	help
 	  Say Y here if you want to connect via USB to network tranceiver.
 	  This device driver depends on the networking AIM.