[PATCH v5] riscv: add freedom E310 Arty A7 bsp

[Sebastian Huber]

Hello Pragnesh,

I fixed the formatting a bit, fixed some warnings and simplified some 
functions. Would you mind testing the latest master branch on your board 
to check if it still runs?

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber at embedded-brains.de
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