drm/msm/dpu: make sure phys resources are properly initialized

The commit b954fa6baaca ("drm/msm/dpu: Refactor rm iterator") removed
zero-init of the hw_ctl array, but didn't change the error condition,
that checked for hw_ctl[i] being NULL. At the same time because of the
early returns in case of an error dpu_encoder_phys might be left with
the resources assigned in the previous state. Rework assigning of hw_pp
/ hw_ctl to the dpu_encoder_phys in order to make sure they are always
set correctly.

Fixes: b954fa6baaca ("drm/msm/dpu: Refactor rm iterator")
Suggested-by: Abhinav Kumar <[email protected]>
Signed-off-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Abhinav Kumar <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/612233/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Abhinav Kumar <[email protected]>

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