Adding rockpro 64

[kgbkgb]

Hi
I have added the rockpro 64 information to armbianio.c.
The previous pin tabulations are disorganized and some are unlabelled, so i added this at the start of the list to avoid the issues further down the list of systems.
I attach the modified armbianio.c which includes "RockPro 64"
armbianio.c.txt