When building specific DTBs out of the kernel tree the vendor subdirs
(boot/dts/<vendor>) are not created, ensure that they are before
building the DTB.
Signed-off-by: NNathan Rossi <nathan.rossi@xilinx.com>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Acked-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>