drm/msm/dpu: drop unused memory allocation

drm/msm/dpu: drop unused memory allocation

Drop the dpu_cfg variable and corresponding kzalloc, which became unused
after changing hw catalog to static configuration.

Fixes: de7d480f5e8c ("drm/msm/dpu: make dpu hardware catalog static const")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/498738/
Link: https://lore.kernel.org/r/20220822172455.282923-1-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>