scripts: Fixed typo in parameter that was causing exception

There is a typo in the logging parameters, "filname" is being used instead of "filename" for yocto-kernel, yocto-layer and wic scripts. This didn't cause issues before since python 2 didn't validate unused parameters but with python >= 3.4.3 an exception is thrown. This patch fixes this parameter name.

[YOCTO #9834]

(From OE-Core rev: 5d123a6ec0e97652b2ec4295428797a336ef357a)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/wic

@@ -294,7 +294,7 @@ subcommands = {
 
 
 def start_logging(loglevel):
-    logging.basicConfig(filname='wic.log', filemode='w', level=loglevel)
+    logging.basicConfig(filename='wic.log', filemode='w', level=loglevel)
 
 
 def main(argv):