[core/analog] Bring analog API to life for SAMG55#60

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AloyseTech wants to merge 2 commits intoaethaniel:masterfrom

AloyseTech:adc_setup

Commits on Apr 11, 2017

[core/analog] Bring analog API to life for SAMG55
AloyseTech
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[core/analog] Fix wrong define for G55. Check if A0 is defined in variant
AloyseTech
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