drm/amdgpu/mes12: update data cache boundary

Enlarge the data cache boundary.

v2: use the fix data cache boundary.

Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>