Fix Zynq interrupts and rearrange FDT files.

[skibo]

Summary

Use a standard Zynq .dtsi file for Zynq-based boards (currently only zybo and zedboard). Fix problem with Zynq interrupts by using interrupt "triples" in .dtsi file. Fix cgem driver so it pays attention to status property.

[andrew]

Have you tried using the Linux dts files in sys/gnu/dts/arm? I prefer us moving towards using them over our non-standard entries.

[skibo]

In D6095#129897, @andrew wrote:

Have you tried using the Linux dts files in sys/gnu/dts/arm? I prefer us moving towards using them over our non-standard entries.

Actually, I did try to make it work by changing/adding the driver compatible names to the ones used in the gnu dts file. But, we don't have the clock infrastructure that Linux has so I have to add clock frequency properties here and there. Is it worth it for me to change compatible and property names to match the gnu file as close as possible?

[gonzo]

We now have clock framework in -CURRENT. So it might be worthwhile project to migrate FreeBSD to upstream dts. But I believe this patch should be committed anyways, to fix current breakage, and migrating to gnu/dts should be the next step.

[skibo]

I did not know about the clock framework. I can look into migrating the Zynq stuff to it but I may not get to it in time for 11.0-RELEASE. I'd like to see this committed and treat migrating to the gnu dts as a separate project.