anv: implement VK_KHR_fragment_shading_rate

anv: implement VK_KHR_fragment_shading_rate

Available on Gen11+.

v2: Order shading rate in correct order (Samuel)

v3: Move CPS_STATE emission to genX_state.c

v4: Don't override various output structures (Jason)

v5: Rebase on top master (Lionel)

v6: Fix invalid VkPhysicalDeviceFragmentShadingRatePropertiesKHR
    (min|max)FragmentShadingRateAttachmentTexelSize values (Ken)
    Drop #endif comment

v7: Limit extension to Gfx11+ (Lionel)
    Support conservative raster (Lionel)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7455>