meta-digi: remove machine specific WPA_DRIVER

Now that the MX5 platforms have been removed the only value for
WPA_DRIVER is 'nl80211' (used by Atheros wireless driver), so there is
no need to have a platform specific value.

Just initialize the value in the init-ifupdown recipe with a weak
assignment so it can be override from the project's local.conf.

https://jira.digi.com/browse/DEL-1890
https://jira.digi.com/browse/DEL-1969

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

meta-digi-arm/conf/machine/include/ccardimx28.inc

@@ -13,9 +13,6 @@ UBOOT_ENTRYPOINT = "0x40008000"
 UBOOT_SUFFIX = "sb"
 UBOOT_SYMLINK = "u-boot-${MACHINE}.${UBOOT_SUFFIX}"
 
-# wpa_supplicant driver to use in '/etc/network/interfaces'
-WPA_DRIVER = "nl80211"
-
 # Wireless external module
 WIRELESS_MODULE ?= ""
 WIRELESS_MODULE_append = "${@base_contains('MACHINE_FEATURES', 'wifi', 'kernel-module-atheros', '', d)}"

meta-digi-arm/conf/machine/include/ccimx6.inc

@@ -13,9 +13,6 @@ UBOOT_ENTRYPOINT = "0x10800000"
 UBOOT_SUFFIX = "imx"
 UBOOT_SYMLINK = "u-boot-${MACHINE}.${UBOOT_SUFFIX}"
 
-# wpa_supplicant driver to use in '/etc/network/interfaces'
-WPA_DRIVER = "nl80211"
-
 # Wireless external module
 WIRELESS_MODULE ?= ""
 

meta-digi-dey/recipes-core/init-ifupdown/init-ifupdown_1.0.bbappend

@@ -13,7 +13,7 @@ SRC_URI_append = " \
     file://resolv \
 "
 
-WPA_DRIVER ?= "wext"
+WPA_DRIVER ?= "nl80211"
 
 do_install_append() {
 	# Install DNS servers handler