Staging: rtl8192u: make it compile

Add it to staging Kbuild and fixes some API differences that prevents
compilation.

It seems that the ieee80211 stack is very close to rtl8192su one.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index 5dccf6b..6fbbedb 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -77,6 +77,8 @@
 
 source "drivers/staging/rtl8192su/Kconfig"
 
+source "drivers/staging/rtl8192u/Kconfig"
+
 source "drivers/staging/rtl8192e/Kconfig"
 
 source "drivers/staging/mimio/Kconfig"