Fixes tags need work in the dma-mapping tree

[Mark Brown]

In commit

  3faa52b77c912 ("dma-debug: Skip cacheline tracking for MMIO mappings")

Fixes tag

  Fixes: 3aa31a8bb11e ("dma-buf: provide phys_vec to scatter-gather  mapping routine")

has these problem(s):

  - Subject does not match target commit subject
    Just use
	git log -1 --format='Fixes: %h ("%s")'

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