anv: Advertise VK_KHR_maintenance2

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/vulkan/anv_extensions.py

@@ -70,6 +70,7 @@ EXTENSIONS = [
     Extension('VK_KHR_image_format_list',                 1, True),
     Extension('VK_KHR_incremental_present',               1, True),
     Extension('VK_KHR_maintenance1',                      1, True),
+    Extension('VK_KHR_maintenance2',                      1, True),
     Extension('VK_KHR_push_descriptor',                   1, True),
     Extension('VK_KHR_relaxed_block_layout',              1, True),
     Extension('VK_KHR_sampler_mirror_clamp_to_edge',      1, True),