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

drm/msm/hdmi: 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.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/711172/
Link: https://lore.kernel.org/r/20260311-drm-msm-hdmi-cleanup-v1-4-c5535245f6de@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>