Staging: rt28x0: Add proper selection of WIRELESS_EXT and WEXT_PRIV

After the incorporation of the patch entitled "wext: refactor", some
of the wireless drivers in drivers/staging fail to build because they
need to have CONFIG_WIRELESS_EXT and CONFIG_WEXT_PRIV defined.

[ patch description borrowed from the previous fix for wireless staging
  drivers ("staging: Add proper selection of WIRELESS_EXT and WEXT_PRIV")
  authored by Larry Finger ]

Cc: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/rt2860/Kconfig

 config RT2860
 	tristate "Ralink 2860/3090 wireless support"
 	depends on PCI && X86 && WLAN
+	select WIRELESS_EXT
+	select WEXT_PRIV
 	---help---
 	  This is an experimental driver for the Ralink 2860 and 3090
 	  wireless chips.

drivers/staging/rt2870/Kconfig

 config RT2870
 	tristate "Ralink 2870/3070 wireless support"
 	depends on USB && X86 && WLAN
+	select WIRELESS_EXT
+	select WEXT_PRIV
 	---help---
 	  This is an experimental driver for the Ralink xx70 wireless chips.