intel/fs: handle interpolation modes for at_sample and at_offset too
Cc: mesa-stable
Fixes dEQP-VK.draw..linear_interpolation. Reviewed-by: Lionel Landwerlin lionel.g.landwerlin@intel.com
Cc: mesa-stable
Fixes dEQP-VK.draw..linear_interpolation. Reviewed-by: Lionel Landwerlin lionel.g.landwerlin@intel.com