Fixes tags need work in the drm tree

[Mark Brown]

In commit

  6cd33b6f4155e ("drm/msm/dsi: round 6G byte clock rate to the PLL-achievable 
value")

Fixes tag

  Fixes: 6b16f05aa39f ("drm/msm/dsi: Split clk rate setting and enable")

has these problem(s):

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

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