Update SAML21J18A target to Mbed OS 5.12#8658

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janjongboom wants to merge 5 commits intoARMmbed:masterfrom

janjongboom:feature-saml21-mbed5-rebased

Commits on Mar 4, 2019

Update SAML21J18A target to Mbed OS 5.12
janjongboom
committed
Swapping I2C pins between original and extended PAD

Hasnain Virk
authored and
janjongboom
committed
Adding us ticker to SAML21

Hasnain Virk
authored and
janjongboom
committed
Fix compilation on SAML21J18A
janjongboom
committed
Fix issue with prescaler
janjongboom
committed