Bump buidlroot version to 2018.02.6

bsp/buildroot/board/chromebook/snow/mksd.sh

@@ -14,8 +14,8 @@
 # cgpt does not create protective MBR, and the kernel refuses to read
 # GPT unless there's some kind of MBR in sector 0. So we need parted
 # to write that single sector before doing anything with the GPT.
-cgpt=$HOST_DIR/usr/bin/cgpt
-parted=$HOST_DIR/usr/sbin/parted
+cgpt=$HOST_DIR/bin/cgpt
+parted=$HOST_DIR/sbin/parted
 kernel=$BINARIES_DIR/uImage.kpart
 rootfs=$BINARIES_DIR/rootfs.ext2
 

bsp/buildroot/board/chromebook/snow/readme.txt

@@ -88,7 +88,7 @@ you will probably want the rootfs to occupy the whole remaining space.
 
 cgpt may be used to check current layout:
 
-	output/host/usr/bin/cgpt show $SD
+	output/host/bin/cgpt show $SD
 
 All sizes and all offsets are in 512-byte blocks.
 

bsp/buildroot/board/chromebook/snow/sign.sh

@@ -5,9 +5,9 @@
 # The resulting file is called uImage.kpart.
 
 BOARD_DIR=$(dirname $0)
-mkimage=$HOST_DIR/usr/bin/mkimage
-futility=$HOST_DIR/usr/bin/futility
-devkeys=$HOST_DIR/usr/share/vboot/devkeys
+mkimage=$HOST_DIR/bin/mkimage
+futility=$HOST_DIR/bin/futility
+devkeys=$HOST_DIR/share/vboot/devkeys
 
 run() { echo "$@"; "$@"; }
 die() { echo "$@" >&2; exit 1; }