drm/amd/display: Rename EDID_BLOCK_SIZE to DC_EDID_BLOCK_SIZE

Signed-off-by: Joshua Aberback <joshua.aberback@amd.com>
Reviewed-by: Abdoulaye Berthe <Abdoulaye.Berthe@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>