add SAMC21 support , and wait ready retry (SAMC21 need 6ms to eerase…#123

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xeno27 wants to merge 1 commit intoshumatech:masterfrom xeno27:master

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Commits on Feb 20, 2020

add SAMC21 support , and wait ready retry (SAMC21 need 6ms to eerase page)

Metzner
authored and
Metzner
committed