Signed-off-by: uhashim-arm <umair.hashim@arm.com>

Including the rockchip-linux/rkbin git repo in the manifest. This repo
contains tools and executibles required to build the firmware and
binaries as well as the tools required to talk to the board and flash
the built binaries

Signed-off-by: uhashim-arm <umair.hashim@arm.com>

Signed-off-by: Grant Likely <grant.likely@arm.com>