drm/amd/display: Handle persistence in DM
[Why] Remove dm_write_persistent_data and dm_read_persistent_data as persistence should be handled in DM. [How] Remove functions. Move read/write calls into DM layer while maintaining logic. Signed-off-by: Jaehyun Chung <jaehyun.chung@amd.com> Reviewed-by: Anthony Koo <Anthony.Koo@amd.com> Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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