Staging: rtl8187se: Fix Sparse Warnings

This patch fixes the Sparse Warnings "symbol was
not declared. Should it be static?" so it removes
some extern expressions to r8180.h and it defines
some extern expressions in ieee80211.h

Signed-off-by: Ebru Akagunduz <ebru.akagunduz@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>