panvk: Fill maxCustomBorderColorSamplers

dEQP-VK doesn't seem to test it, but the validation layer complains.
Pick a randomly high value, since there's no physical limit on the
custom border color (this is part of the sampler descriptor).

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28417>

src/panfrost/vulkan/panvk_physical_device.c

@@ -675,6 +675,12 @@ panvk_GetPhysicalDeviceProperties2(VkPhysicalDevice physicalDevice,
          properties->maxVertexAttribDivisor = UINT32_MAX;
          break;
       }
+      case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_CUSTOM_BORDER_COLOR_PROPERTIES_EXT: {
+         VkPhysicalDeviceCustomBorderColorPropertiesEXT *properties =
+            (VkPhysicalDeviceCustomBorderColorPropertiesEXT *)ext;
+         properties->maxCustomBorderColorSamplers = 32768;
+         break;
+      }
       default:
          break;
       }