grove: mraa_init is done at mraa module or library load
grove: mraa_init is done at mraa module or library load

Signed-off-by: Petre Eftime <f6678a3167cad509dc066380a23bdcc0514aff10@intel.com>
Signed-off-by: Andrei Vasiliu <6cdfc3f07526ca8509c79e95022719f3e4f2f781@intel.com>
Signed-off-by: Mihai Tudor Panu <a27de6130c5d32f5817bf40bb8b348582f37a8af@intel.com>

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