Staging: cxt1e1: Kconfig: SBE_PMCC4_NCOMM can not be compiled as module, adjust help description

The Kconfig description for CONFIG_SBE_PMCC4_NCOMM says:

  If you have purchased this optional support you must say Y or M
  here to allow the driver to operate with the NCOMM product.

This is not correct as it can not be built as module,
this patch updates the description accordingly.
Signed-off-by: Michael Prokop <mika@grml.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/cxt1e1/Kconfig

@@ -18,5 +18,5 @@ config SBE_PMCC4_NCOMM
 	---help---
       SBE supplies optional support for NCOMM products.
 
-      If you have purchased this optional support you must say Y or M
+      If you have purchased this optional support you must say Y
       here to allow the driver to operate with the NCOMM product.