drm/msm/dpu: drop dpu_hw_blk_destroy function

The dpu_hw_blk_destroy() function is empty, so we can drop it now.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20210515190909.1809050-3-dmitry.baryshkov@linaro.org


Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>