Update buidlroot to version 2016.08.1

bsp/buildroot/board/firefly/firefly-rk3288/readme.txt

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+Firefly RK3288
+
+How to build it
+===============
+
+  $ make firefly_rk3288_defconfig
+
+Then you can edit the build options using
+
+  $ make menuconfig
+
+Compile all and build rootfs image:
+
+  $ make
+
+Result of the build
+-------------------
+
+After building, you should get a tree like this:
+
+  output/images/
+  ├── rk3288-firefly.dtb
+  ├── rootfs.ext2
+  ├── rootfs.ext4 -> rootfs.ext2
+  ├── sdcard.img
+  ├── u-boot-dtb.img
+  ├── u-boot-spl-dtb.bin
+  ├── u-boot-spl-dtb.img
+  └── uImage
+
+Prepare your SDCard
+===================
+
+Buildroot generates a ready-to-use SD card image that you can flash directly to
+the card. The image will be in output/images/sdcard.img.
+You can write this image directly to an SD card device (i.e. /dev/xxx):
+
+  $ dd if=output/images/sdcard.img of=/dev/xxx
+
+Finally, you can insert the SD card to the Firefly RK3288 board and boot it.