drm/msm/dpu: set max cursor width to 512x512

Override the default max cursor size reported to userspace of 64x64.
MSM8998 hw cursor planes support 512x512 size, and other chips use DMA
SSPPs.

Signed-off-by: Arnaud Vrac <avrac@freebox.fr>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/532903/
Link: https://lore.kernel.org/r/20230419-dpu-tweaks-v1-9-d1bac46db075@freebox.fr


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