microblaze-v5.4-rc1

Microblaze patches for 5.4-rc1

- Clean up reset gpio handler
- Defconfig updates
- Add support for 8 byte get_user()
- Switch to generic dma code

In merge please fix dma_atomic_pool_init reported also by:
https://lkml.org/lkml/2019/9/2/393
or
https://lore.kernel.org/linux-next/20190902214011.2a5400c9@canb.auug.org.au/
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