nl80211: move vendor/testmode event skb functions out of ifdef

The vendor/testmode event skb functions are needed outside
the ifdef for vendor-specific events, so move them out.

Change-Id: Ide22eb7326bdd524d04f8a7ec3398cdf0a5a88f7
Reported-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: e03ad6eade141daf0df07f1c312e8ae702327939
Git-repo: kernel.googlesource.com/pub/scm/linux/kernel/git/jberg/mac80211-next
Signed-off-by: Amar Singhal <asinghal@codeaurora.org>