Zynq and ZynqMP linkcmds changes

[Sebastian Huber]

Hello,

I checked in four patches to simplify the linkcmds generation. I hope 
that I didn't break anything with this.

The patches help a bit to get started with the new build system.

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
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