drm/msm/dpu: also use KBps for bw_ctl output

Change debugfs and log entries to use KBps / u32 for bw_ctl and similar
data.

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/636066/
Link: https://lore.kernel.org/r/20250209-dpu-perf-rework-v5-5-87e936cf3004@linaro.org