configs/orange-pi-zero-plus2: enable WiFi support

Orange-Pi Zero Plus2 board has AP6212 WiFi/BT combo, but does
not have ethernet port. So it makes sense to enable wireless
networking by default:

- add DTS patch enabling AP6212 WiFi/BT combo support
  -- this patch is on its way to mainline Linux v4.16
- enable WiFi support in kernel config
- enable Broadcom brcmfmac kernel driver in kernel config
- add Broadcom wireless firmware package to image
- add basic wireless tools to image
- add mdev to image to enable module autoloading
- add rootfs overlay with proper NVRAM file for on-board AP6212 chip

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/orangepi_zero_plus2_defconfig

@@ -2,8 +2,10 @@ BR2_aarch64=y
 BR2_cortex_a53=y
 BR2_ARM_FPU_VFPV4=y
 
-# Linux headers same as kernel, a 4.15 series
 BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_15=y
+BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV=y
+BR2_GLOBAL_PATCH_DIR="board/orangepi/orangepi-zero-plus2/patches"
+BR2_ROOTFS_OVERLAY="board/orangepi/orangepi-zero-plus2/rootfs_overlay"
 
 # Firmware
 BR2_TARGET_ARM_TRUSTED_FIRMWARE=y
@@ -35,6 +37,19 @@ BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.15.2"
 BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="allwinner/sun50i-h5-orangepi-zero-plus2"
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/orangepi/orangepi-zero-plus2/linux-extras.config"
+
+# wireless firmware
+BR2_PACKAGE_LINUX_FIRMWARE=y
+BR2_PACKAGE_LINUX_FIRMWARE_BRCM_BCM43XXX=y
+
+# wireless tools
+BR2_PACKAGE_IW=y
+BR2_PACKAGE_WIRELESS_TOOLS=y
+BR2_PACKAGE_WIRELESS_TOOLS_LIB=y
+BR2_PACKAGE_WPA_SUPPLICANT=y
+BR2_PACKAGE_WPA_SUPPLICANT_NL80211=y
+BR2_PACKAGE_WPA_SUPPLICANT_CLI=y
 
 # Filesystem
 BR2_TARGET_GENERIC_ISSUE="Welcome to Orangepi Zero Plus2"