vallium: disable VK_KHR_shader_float16_int8.

This is actually a TODO.

Fixes:
dEQP-VK.info.device_mandatory_features

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6381>
1 file changed