drm/msm/dpu: Consistently use u32 instead of uint32_t

drm/msm/dpu: Consistently use u32 instead of uint32_t

Linux coding style asks to use kernel types like u32 instead of uint32_t
and code already has it in other places, so unify the remaining pieces.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/659623/
Link: https://lore.kernel.org/r/20250618-b4-sm8750-display-v7-9-a591c609743d@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>