Staging: wlan-ng: defined oui_rfc1042[] and oui_8021h[] arrays as const arrays

This patch defines oui_rfc1042[] and oui_8021h[] arrays from
p80211conv.c as const arrays since these are not changed
anywhere in code.

Signed-off-by: Claudiu Beznea <claudiu.beznea@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>