anv: Disable VK_KHR_16bit_storage
The testing for this extension is currently very poor. The CTS tests only test accessing UBOs and SSBOs at dynamic offsets so none of our constant-offset paths get triggered at all. Also, there's an assertion in our handling of nir_intrinsic_load_uniform that offset % 4 == 0 which is never triggered indicating that nothing every gets loaded from an offset which is not a dword. Both push constants and the constant offset pull paths are complex enough, we really don't want to ship without tests. We'll turn the extension back on once we have decent tests.
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