anv: Enable VK_KHR_16bit_storage for PushConstant

Enables storagePushConstant16 features of VK_KHR_16bit_storage for Gen8+.
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/intel/vulkan/anv_device.c

@@ -797,7 +797,7 @@ void anv_GetPhysicalDeviceFeatures2KHR(
 
          features->storageBuffer16BitAccess = pdevice->info.gen >= 8;
          features->uniformAndStorageBuffer16BitAccess = pdevice->info.gen >= 8;
-         features->storagePushConstant16 = false;
+         features->storagePushConstant16 = pdevice->info.gen >= 8;
          features->storageInputOutput16 = false;
          break;
       }