vk_pipeline_cache: Fix num of pipeline workers on weird platforms

src/video_core/renderer_vulkan/vk_pipeline_cache.cpp

@@ -608,7 +608,7 @@ PipelineCache::PipelineCache(RasterizerVulkan& rasterizer_, Tegra::GPU& gpu_,
       scheduler{scheduler_}, descriptor_pool{descriptor_pool_},
       update_descriptor_queue{update_descriptor_queue_}, render_pass_cache{render_pass_cache_},
       buffer_cache{buffer_cache_}, texture_cache{texture_cache_},
-      workers(std::thread::hardware_concurrency() - 1, "yuzu:PipelineBuilder"),
+      workers(std::max(std::thread::hardware_concurrency(), 2U) - 1, "yuzu:PipelineBuilder"),
       serialization_thread(1, "yuzu:PipelineSerialization") {
     const auto& float_control{device.FloatControlProperties()};
     const VkDriverIdKHR driver_id{device.GetDriverID()};