Am 02.02.2017 um 09:37 schrieb Michael Zoran:

This is actually a problem I had to deal with way in the begging of
ARM64.  What was done in the github tree was to have the one of the DTS
  files(in this case 64) #include the 32 bit dts.  That way it's not
needed to have the symbolic link and install should work.

I know it's ulgy, but it works...

Take a look at:
https://github.com/raspberrypi/linux/blob/rpi-4.10.y/arch/arm64/boot/dt
s/broadcom/bcm2710-rpi-3-b.dts

Here is what the file contains:
#define RPI364

#include "../../../../arm/boot/dts/bcm2710-rpi-3-b.dts"

This do not work in the context of the split device-tree repository [0] 
(where the directory structure differs).

[0] 
https://git.kernel.org/cgit/linux/kernel/git/devicetree/devicetree-rebasing.git/