ui: make default_face_kpts_3d constexpr (#30239)

selfdrive/ui/ui.h

@@ -26,7 +26,7 @@ typedef cereal::CarControl::HUDControl::AudibleAlert AudibleAlert;
 
 const mat3 DEFAULT_CALIBRATION = {{ 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0 }};
 
-const vec3 default_face_kpts_3d[] = {
+constexpr vec3 default_face_kpts_3d[] = {
   {-5.98, -51.20, 8.00}, {-17.64, -49.14, 8.00}, {-23.81, -46.40, 8.00}, {-29.98, -40.91, 8.00}, {-32.04, -37.49, 8.00},
   {-34.10, -32.00, 8.00}, {-36.16, -21.03, 8.00}, {-36.16, 6.40, 8.00}, {-35.47, 10.51, 8.00}, {-32.73, 19.43, 8.00},
   {-29.30, 26.29, 8.00}, {-24.50, 33.83, 8.00}, {-19.01, 41.37, 8.00}, {-14.21, 46.17, 8.00}, {-12.16, 47.54, 8.00},