drm/amd/display: Fix dc_version detect for dcn314

[Why]
While parsing dc_version redundant check leads to
invalid dc_version for dcn314.

[How]
Remove redundant check

Fixes: ee7b62e1 ("drm/amd/display: Enable DCN314 in DC")
Signed-off-by: Roman Li <roman.li@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>