add regmap package to facilitate heapless driver development #768
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@ysoldak @aykevl @deadprogram
Discussion in #766 made me consider adding this logic which is common to many 8 bit address width drivers. The name comes from "Register Mapped"
I've added only the functions which have a trivial heapless solution. The trivial implementation for WriteDataSPI and WriteDataI2C would require copy+additional buffer provided so I avoided it for now to see if we can think of a solution that maybe does not require the copy, i.e: transactional API.