Bump buidlroot version to 2018.02.6

bsp/buildroot/package/dtc/Config.in

@@ -6,7 +6,8 @@ config BR2_PACKAGE_DTC
 	  a given format and outputs a device-tree in another format.
 
 	  Note that only the library is installed.
-	  If you want the programs, say 'y' here, and to "dtc programs", below.
+	  If you want the programs, say 'y' here, and to "dtc programs",
+	  below.
 
 	  https://git.kernel.org/cgit/utils/dtc/dtc.git
 
@@ -19,13 +20,14 @@ config BR2_PACKAGE_DTC_PROGRAMS
 	    - convert-dtsv0     convert from version 0 to version 1
 	    - dtc               the device tree compiler
 	    - dtdiff            compare two device trees (needs bash)
-	    - fdtdump           print a readable version of a flat device tree
+	    - fdtdump           print a readable version of a
+	                        flat device tree
 	    - fdtget            read values from device tree
 	    - fdtput            write a property value to a device tree
 
-	  Note: dtdiff requires bash, so if bash is not selected, dtdiff will
-	        be removed from the target file system. Enable bash if you
-	        need dtdiff on the target.
+	  Note: dtdiff requires bash, so if bash is not selected, dtdiff
+	  will be removed from the target file system. Enable bash if
+	  you need dtdiff on the target.
 
 comment "dtdiff will not be installed: it requires bash"
 	depends on BR2_PACKAGE_DTC_PROGRAMS