Bump buidlroot version to 2018.02.6

bsp/buildroot/package/memtool/Config.in

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+config BR2_PACKAGE_MEMTOOL
+	bool "memtool"
+	help
+	  Development tool to modify memory mapped registers.
+
+	  memtool allows one to read and write memory mapped registers
+	  via /dev/mem. The commands are inspired by the respective
+	  commands of the barebox bootloader.  This is handy during
+	  driver development to inspect and modify register
+	  settings. It can also be used to modify regular files and
+	  character devices (e.g. to paint to /dev/fb0).
+
+	  http://www.pengutronix.de/software/memtool/index_en.html

bsp/buildroot/package/memtool/memtool.hash

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+# Locally computed:
+sha256  58309d356cb9b45a241cb602ca3850891a70ddaa93ced51d1cced78e14767680  memtool-2016.10.0.tar.xz

bsp/buildroot/package/memtool/memtool.mk

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+################################################################################
+#
+# memtool
+#
+################################################################################
+
+MEMTOOL_VERSION = 2016.10.0
+MEMTOOL_SITE = http://public.pengutronix.de/software/memtool
+MEMTOOL_SOURCE = memtool-$(MEMTOOL_VERSION).tar.xz
+MEMTOOL_LICENSE = GPL-2.0
+MEMTOOL_LICENSE_FILES = COPYING
+
+$(eval $(autotools-package))