drm/msm/dpu: use sm8350_regdma on SM8350 platform

drm/msm/dpu: use sm8350_regdma on SM8350 platform

Correct sm8350_dpu_cfg.dma_cfg to point to sm8350_regdma rather than
sm8250_regdma.

Fixes: 0e91bcbb0016 ("drm/msm/dpu: Add SM8350 to hw catalog")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/518791/
Link: https://lore.kernel.org/r/20230118020455.1689929-2-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>