This pull request contains updates for UBI and UBIFS:

UBI:
        - Add Zhihao Cheng as reviewer
	- Attach via device tree
	- Add NVMEM layer
	- Various fastmap related fixes

UBIFS:
        - Add Zhihao Cheng as reviewer
	- Convert to folios
	- Various fixes (memory leaks in error paths, function prototypes)
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