[C72] Move C72 Nano files to generic C72 directory and enable compilation of Mini and Nano using the same board directory
We want to unify as much code as possible between C72 Nano and C72 Mini: strap_cfg.h, strap_cfg.c, env_conf.h will be in common
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We want to unify as much code as possible between C72 Nano and C72 Mini: strap_cfg.h, strap_cfg.c, env_conf.h will be in common