handle register derivedFrom#193

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wez wants to merge 4 commits intorust-embedded:masterfrom

wez:register-derived-from

Commits on Aug 22, 2018

First pass at implementing derivedFrom.

nsabovic
authored and
wez
committed
fixup semicolons
wez
committed
expand derived registers
wez
committed

Commits on Aug 23, 2018

point to svd master
wez
committed