configs/orangepi_lite2: add WiFi support

Orangepi lite2 board has AP6356S WiFi/BT combo, but does
not have ethernet port. So it makes sense to enable wireless
networking by default:
- add broadcom wireless firmware package to image
- add basic wireless tools to image
- add rootfs overlay with proper NVRAM file for on-board AP6356S chip
- add mdev to image to enable module autoloading
- update readme.txt to test wifi

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

board/orangepi/orangepi-lite2/readme.txt

@@ -33,3 +33,12 @@ Copy the bootable "sdcard.img" onto an SD card with "dd":
 
 Insert the micro SDcard in your Orangepi Lite2 and power it up. The console
 is on the serial line, 115200 8N1.
+
+WiFi
+====
+
+ # wpa_passphrase ACCESSPOINTNAME >> /etc/wpa_supplicant.conf
+   (type password and enter)
+ # wpa_supplicant -i wlan0 -c /etc/wpa_supplicant.conf -B
+ # udhcpc -i wlan0
+ # ping google.com

board/orangepi/orangepi-lite2/rootfs_overlay/lib/firmware/brcm/brcmfmac43455-sdio.txt

@@ -0,0 +1,82 @@
+#AP6255_NVRAM_V1.0_29052015
+
+NVRAMRev=$Rev: 498373 $
+sromrev=11
+vendid=0x14e4
+devid=0x43ab
+manfid=0x2d0
+prodid=0x06e4
+macaddr=00:90:4c:c5:12:38
+nocrc=1
+boardtype=0x6e4
+boardrev=0x1304
+xtalfreq=37400
+#boardflags: 5GHz eTR switch by default
+#2.4GHz eTR switch by default
+#bit1 for btcoex
+boardflags=0x00080201
+boardflags2=0x40000000
+boardflags3=0x48200100
+rxgains2gelnagaina0=0
+rxgains2gtrisoa0=0
+rxgains2gtrelnabypa0=0
+rxgains5gelnagaina0=0
+rxgains5gtrisoa0=0
+rxgains5gtrelnabypa0=0
+rxchain=1
+txchain=1
+aa2g=1
+aa5g=1
+tssipos5g=1
+tssipos2g=1
+femctrl=0
+AvVmid_c0=0,157,1,126,1,126,1,126,1,126
+pa2ga0=-112,6296,-662
+pa2ga1=-165,3699,-515
+pa5ga0=-143,6016,-683,-141,6013,-678,-137,5988,-670,-136,5982,-670
+pa5ga1=-161,3544,-499,-166,3543,-497,-169,3569,-497,-171,3598,-498
+itrsw=1
+pdoffset2g40ma0=10
+pdoffset40ma0=0xaaaa
+pdoffset80ma0=0xaaaa
+extpagain5g=2
+extpagain2g=2
+tworangetssi2g=1
+tworangetssi5g=1
+# LTECX flags
+# WCI2
+ltecxmux=0
+ltecxpadnum=0x0504
+ltecxfnsel=0x22
+ltecxgcigpio=0x32
+
+maxp2ga0=64
+ofdmlrbw202gpo=0x0033
+dot11agofdmhrbw202gpo=0x1553
+mcsbw202gpo=0x99355533
+
+maxp5ga0=80,82,76,77
+
+mcsbw205glpo=0x99755000
+mcsbw205gmpo=0x9df55000
+mcsbw205ghpo=0x99855000
+
+mcsbw405glpo=0xb8555000
+mcsbw405gmpo=0xed955000
+mcsbw405ghpo=0xd9755000
+
+mcsbw805glpo=0xc8555000
+mcsbw805gmpo=0xe9555000
+mcsbw805ghpo=0xd9555000
+
+swctrlmap_2g=0x00040004,0x00020002,0x00040004,0x010a02,0x1ff
+swctrlmap_5g=0x00100010,0x00200020,0x00100010,0x010a02,0x2f4
+swctrlmapext_5g=0x00000000,0x00000000,0x00000000,0x000000,0x000
+swctrlmapext_2g=0x00000000,0x00000000,0x00000000,0x000000,0x000
+
+vcodivmode=1
+deadman_to=481500000
+ed_thresh2g=-54
+ed_thresh5g=-54
+
+muxenab=0x10

configs/orangepi_lite2_defconfig

@@ -42,6 +42,19 @@ BR2_TARGET_ROOTFS_EXT2_4=y
 BR2_PACKAGE_HOST_DOSFSTOOLS=y
 BR2_PACKAGE_HOST_GENIMAGE=y
 BR2_PACKAGE_HOST_MTOOLS=y
+BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV=y
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
 BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/orangepi/orangepi-lite2/genimage.cfg"
 BR2_ROOTFS_POST_BUILD_SCRIPT="board/orangepi/orangepi-lite2/post-build.sh"
+BR2_ROOTFS_OVERLAY="board/orangepi/orangepi-lite2/rootfs_overlay"
+
+# wireless firmware
+BR2_PACKAGE_LINUX_FIRMWARE=y
+BR2_PACKAGE_LINUX_FIRMWARE_BRCM_BCM43XXX=y
+
+# wireless tools
+BR2_PACKAGE_IW=y
+BR2_PACKAGE_WPA_SUPPLICANT=y
+BR2_PACKAGE_WPA_SUPPLICANT_NL80211=y
+BR2_PACKAGE_WPA_SUPPLICANT_AP_SUPPORT=y
+BR2_PACKAGE_WPA_SUPPLICANT_PASSPHRASE=y