required HDMI drivers are not available

[peteasa]

@olajep I have proven the hdmi drivers now. The set of new drivers is contained in these patches https://github.com/peteasa/meta-parallella/tree/a6e8e77582c3000d07331ac950ea6ace2e02565b/recipes-kernel/linux/linux-parallella/4.4

(with the exception of 0011-Cache-elink-rxcfg-reg.patch.. this is not to do with hdmi)

I can provide these as a pull request to parallella-linux plus the associated device tree changes.

Let me know if this works for you.