Radeon RX 5700XT CN-GPU auto config optimisation

[Ryo-RU]

RX 5700XT Cryptonight-GPU
2 Threading autogenerated config with intensity of 960 (as it is being set now) and standart worksize of 8 gives better result there. Tried varios 1-2-4 thread and 8-16 worksize combinations with increasing intensity. The best so far result was achieved by doubling autogenerated config on threads.
Screenshot of table on imgur of 1-2 threading and varios intensities
(4 threads produce invalid shares on all range of settings so no sense to include here)

• another interesting issue related to this GPU and CN-GPU: unroll 8 gives better hashrate vs standard unroll 1 (first time I see that) [Link]

Thanks to newtoetn and CryptoNuffe from discord for help and feedback

[Ryo-RU]

various values of unroll: even 2 is better than 1 [Imgur Link]

[Ryo-RU]

got a confirmation for non-xt version about better performance with 2 threads and unroll set to 8.
Unroll 1: 1586hs
Unroll 8: 1626hs

Both xt and non-xt perform best with 2T config, with a worksize of 8 and unroll 8.