Bump buidlroot version to 2018.02.6

bsp/buildroot/package/rpi-bt-firmware/Config.in

@@ -0,0 +1,8 @@
+config BR2_PACKAGE_RPI_BT_FIRMWARE
+	bool "rpi-bt-firmware"
+	depends on BR2_arm || BR2_aarch64
+	help
+	  Raspberry Pi 3 and Zero W Broadcom BCM43438 Bluetooth module
+	  firmware.
+
+	  https://aur.archlinux.org/packages/pi-bluetooth

bsp/buildroot/package/rpi-bt-firmware/rpi-bt-firmware.hash

@@ -0,0 +1,2 @@
+# Locally computed
+sha256 5d9c9364277414ffd67b4a266cdf88e92f28eb937e5a413750e87b7a94161bef  rpi-bt-firmware-a439f892bf549ddfefa9ba7ad1999cc515f233bf.tar.gz

bsp/buildroot/package/rpi-bt-firmware/rpi-bt-firmware.mk

@@ -0,0 +1,21 @@
+################################################################################
+#
+# rpi-bt-firmware
+#
+################################################################################
+
+RPI_BT_FIRMWARE_VERSION = a439f892bf549ddfefa9ba7ad1999cc515f233bf
+RPI_BT_FIRMWARE_SITE = https://aur.archlinux.org/pi-bluetooth.git
+RPI_BT_FIRMWARE_SITE_METHOD = git
+RPI_BT_FIRMWARE_LICENSE = PROPRIETARY
+RPI_BT_FIRMWARE_LICENSE_FILES = LICENCE.broadcom_bcm43xx
+
+# The BlueZ hciattach utility looks for firmware in /etc/firmware. Add a
+# compatibility symlink.
+define RPI_BT_FIRMWARE_INSTALL_TARGET_CMDS
+	ln -sf ../lib/firmware $(TARGET_DIR)/etc/firmware
+	$(INSTALL) -D -m 0644 $(@D)/BCM43430A1.hcd \
+		$(TARGET_DIR)/lib/firmware/BCM43430A1.hcd
+endef
+
+$(eval $(generic-package))