FIX: Forget that the prng was 0x8000 length and not 0xFFFF. Sorry. Also returned...

FIX:  Forget that the prng was 0x8000 length and not 0xFFFF.  Sorry.  Also returned to the decomposed loop.  Don't know if this armsrc optimises this at compilation time. Does someone know?

CHG: returned the iso14443a_setup order, it might influence my older PM3 device.

*Note*  my Elechouse revisions PM3 works great with this but my older xpfga (green pcb) is hopeless.  It can't fix onto the nonces in 'hf mf mifare'  I think its too slow.