amd: fix cubeFaceCoordAMD() tests
func.amd.gcn-shader.cube-face-coord-* now passes on RADV, AMDVLK and the PRO driver.
func.amd.gcn-shader.constant passes on RADV but still crashes on the AMDVLK and PRO driver.
func.amd.gcn-shader.cube-face-coord-* now passes on RADV, AMDVLK and the PRO driver.
func.amd.gcn-shader.constant passes on RADV but still crashes on the AMDVLK and PRO driver.