panvk: Set .pushDescriptor=true

We already claim support for VK_KHR_push_descriptor, so we de-facto
support pushDescriptor.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Olivia Lee <benjamin.lee@collabora.com>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34640>

docs/relnotes/new_features.txt

@@ -1,2 +1,3 @@
 removed clover frontend
 VK_EXT_vertex_input_dynamic_state/vertexInputDynamicState on panvk
+pushDescriptor on panvk

src/panfrost/vulkan/panvk_physical_device.c

@@ -552,6 +552,9 @@ get_features(const struct panvk_physical_device *device,
 
       /* VK_EXT_ycbcr_image_arrays */
       .ycbcrImageArrays = arch >= 10,
+
+      /* VK_KHR_push_descriptor */
+      .pushDescriptor = true,
    };
 }