staging: wilc1000: describe the config symbol fully

This patch removes the warnings reported by checkpatch.pl on the short
description for the config symbol in the Kconfig by adding more comments
to describe the config symbol in more detail.

Signed-off-by: Tony Cho <tony.cho@atmel.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>