radv: fix pointSizeRange limits

The values should match the ones that are emitted.

This fixes new CTS dEQP-VK.rasterization.primitive_size.points.*.

Fixes: f4e499ec ("radv: add initial non-conformant radv vulkan driver")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
(cherry picked from commit 64031718)