drm/msm: dpu: Fix memory leak caused by dropped reference

We are currently leaking a drm_crtc_commit struct for every atomic
commit containing plane state. The dpu plane destroy function cleans up
the fb reference manually, but fails to release the commit ref. As a
result, we just keep allocating drm_crtc_commits without ever freeing
them. Fortunately there's a helper function which will clean up all of
our mess at once, so use that.

Thanks to Doug Anderson for reporting the memory leak (and leaving
breadcrumbs from kmemleak!).

Reported-by: Doug Anderson <[email protected]>
Signed-off-by: Sean Paul <[email protected]>
Signed-off-by: Rob Clark <[email protected]>

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