Fixes tags need work in the powerpc-fixes tree

[Mark Brown]

In commit

  c1c1ffa490fc3 ("powerpc/vtime: Initialize starttime at boot for native 
accounting")

Fixes tag

  Fixes: cf9efce0ce31 ("powerpc: Account time using timebase rather  than PURR")

has these problem(s):

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

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