staging: wlan-ng: remove "autogenerated code" comments

p80211metadef.h and p80211metastruct.h both have comments stating they
are autogenerated and should not be edited. However, neither is
generated during build and both have had numerous manual edits since
the driver has been in staging.

Signed-off-by: Tim Collier <osdevtc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>