hikey960: enable Wi-Fi

Adds the required flags and configuration files to enable Wi-Fi on the
HiKey960 board. The network name and password have to be set in
br-ext/board/hikey960/overlay/etc/wpa_supplicant.conf before building.
Then Wi-Fi can be enabled on the board by running 'ifup wlan0' as root.

Signed-off-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Joakim Bech <joakim.bech@linaro.org>
diff --git a/hikey960.mk b/hikey960.mk
index fe073c6..b5b8f2a 100644
--- a/hikey960.mk
+++ b/hikey960.mk
@@ -13,6 +13,17 @@
 # Needed by buildroot
 CFG_NW_CONSOLE_UART ?= $(CFG_CONSOLE_UART)
 
+# To enable Wi-Fi on HiKey960:
+# 1. Set the network name (SSID) and password in
+#    $(BR2_ROOTFS_OVERLAY)/etc/wpa_supplicant.conf before building
+# 2. Boot the board, login as root and run: ifup wlan0
+BR2_PACKAGE_LINUX_FIRMWARE = y
+BR2_PACKAGE_LINUX_FIRMWARE_TI_WL18XX = y
+BR2_PACKAGE_WPA_SUPPLICANT = y
+BR2_PACKAGE_WIRELESS_REGDB = y
+
+BR2_ROOTFS_OVERLAY = $(ROOT)/build/br-ext/board/hikey960/overlay
+
 ################################################################################
 # Includes
 ################################################################################