drm/amd/display: Update Cursor request mode to the beginning prefetch always

[Why]
The double buffer cursor registers is updated by the cursor
vupdate event. There is a gap between vupdate and curso

drm/amd/display: Update Cursor request mode to the beginning prefetch always

[Why]
The double buffer cursor registers is updated by the cursor
vupdate event. There is a gap between vupdate and cursor data
fetch if cursor fetch data reletive to cursor position.
Cursor corruption will happen if we update the cursor surface
in this gap.

[How]
Modify the cursor request mode to the beginning prefetch always
and avoid wraparound calculation issues.

Reviewed-by: Nicholas Kazlauskas <[email protected]>
Signed-off-by: Zhikai Zhai <[email protected]>
Signed-off-by: Zaeem Mohamed <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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