AMD Light Cache

[luminousmining]

Build light cache with GPU instead of CPU with GPU AMD.

    algo::ethash::initializeDagContext
    (
        context,
        jobInfo.epoch,
        algo::ethash::MAX_EPOCH_NUMBER,
        dagCountItemsGrowth,
        dagCountItemsInit,
        lightCacheCountItemsGrowth,
        lightCacheCountItemsInit,
        true // TODO: build light cache on GPU
    );

    algo::ethash::initializeDagContext
    (
        context,
        jobInfo.epoch,
        maxEpoch,
        dagCountItemsGrowth,
        dagCountItemsInit,
        lightCacheCountItemsGrowth,
        lightCacheCountItemsInit,
        true // TODO: build light cache on GPU
    );