Revert "GPU (macOS): update how integrated GPUs are detected"

This reverts commit 5381395.

Author: CarterLi

src/detection/gpu/gpu_apple.m

@@ -71,7 +71,7 @@
             else if ([device supportsFamily:MTLGPUFamilyCommon1])
                 ffStrbufSetStatic(&gpu->platformApi, "Metal Common 1");
 
-            gpu->type = device.location == MTLDeviceLocationBuiltIn ? FF_GPU_TYPE_INTEGRATED : FF_GPU_TYPE_DISCRETE;
+            gpu->type = device.hasUnifiedMemory ? FF_GPU_TYPE_INTEGRATED : FF_GPU_TYPE_DISCRETE;
             gpu->index = (uint32_t) device.locationNumber;
 
             if (device.hasUnifiedMemory && device.recommendedMaxWorkingSetSize > 0)