meta-digi-del: set correct WPA driver depending on the machine

This fixes a bug in 'ccardxmx28js' where the wpa_supplicant was using
the wrong driver 'wext' instead of the 'nl80211' (for atheros)

https://jira.digi.com/browse/DEL-220 #resolve

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-arm/conf/machine/include/mxs-digi-base.inc

@@ -15,3 +15,6 @@ EXTRA_IMAGEDEPENDS = "u-boot"
 # At the moment it's failing due to wrong u-boot image
 IMAGE_FSTYPES ?= "tar.bz2"
 IMAGE_FSTYPES += "sum.jffs2 ubifs"
+
+# wpa_supplicant driver to use in '/etc/network/interfaces'
+WPA_DRIVER = "nl80211"

meta-digi-del/recipes-core/netbase/netbase_5.0.bbappend

@@ -6,6 +6,8 @@ DEPENDS="virtual/kernel"
 
 SRC_URI += "file://ifup"
 
+WPA_DRIVER ?= "wext"
+
 do_install_append(){
 	install -m 0755 ${WORKDIR}/ifup ${D}${sysconfdir}/network/if-up.d
 }
@@ -69,7 +71,7 @@ iface wlan0 inet static
     network 192.168.43.0
     wireless_mode managed
     wireless_essid any
-    wpa-driver wext
+    wpa-driver ${WPA_DRIVER}
     wpa-conf /etc/wpa_supplicant.conf
 
 EOF