anv: fixup physical device properties of fragment shading rate

We've only enabled the extension on Gfx11+ so no need to care about prior values.

Also fixup values of (min|max)FragmentShadingRateAttachmentTexelSize.

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Fixes: 231651fd ("anv: implement VK_KHR_fragment_shading_rate")