Hexagon: mppdepth is deprecated

Scheduler system on Hexagon is not well working with mppdepth directive.

Due to increased usage of OpenMP on the machine we had to stop supporting mppdepth. 

The new way of running OpenMP is as simple as it was before with mppdepth.

Updated documentation on how to run an OpenMP job you can find here 

https://docs.hpc.uib.no/wiki/Job_execution_(Hexagon)#Parallel.2FOpenMP_jobs
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