drm/msm/dpu: fix cursor block register bit offset in msm8998 hw catalog

This matches the value for both fbdev and sde implementations in the
downstream msm-4.4 repository.

Signed-off-by: Arnaud Vrac <avrac@freebox.fr>
Fixes: 94391a14 ("drm/msm/dpu1: Add MSM8998 to hw catalog")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/532899/
Link: https://lore.kernel.org/r/20230419-dpu-tweaks-v1-8-d1bac46db075@freebox.fr


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>