move to https://github.com/rockchip-linux/u-boot/releases

20160920
  1. add rk3399 support
  2. fix some bugs
20160818
  1. checkout to internal branch, delete temporary patches
20160814
  1. support adb
20160809
  1. add audio support for fennec board
  2. add wifi/bt support for evb/fennec/kylin board
20160728
  1. add rk3036 support