radv: enable VK_KHR_shader_float_controls on GFX6-GFX7

Disable 16-bit features because fp16 isn't exposed on these chips.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
49 jobs for !2382 with radv_shader_float_controls_sicik in 11 minutes and 32 seconds (queued for 3 seconds)
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