GPU (Linux): don't detect frequency for AMD cards

It's current frequency and may hang for some reason

Author: CarterLi

src/detection/gpu/gpu.h

@@ -32,7 +32,7 @@ typedef struct FFGPUResult
     FFstrbuf platformApi;
     double temperature;
     int32_t coreCount;
-    double frequency; // Real time clock frequency in GHz
+    double frequency; // Maximum time clock frequency in GHz
     FFGPUMemory dedicated;
     FFGPUMemory shared;
     uint64_t deviceId; // Used internally, may be uninitialized

src/detection/gpu/gpu_linux.c

@@ -92,11 +92,6 @@ static void pciDetectAmdSpecific(const FFGPUOptions* options, FFGPUResult* gpu,
             gpu->temperature = (double) value / 1000;
     }
 
-    ffStrbufSubstrBefore(pciDir, hwmonLen);
-    ffStrbufAppendS(pciDir, "freq1_input"); // The gfx/compute clock in hertz
-    if (ffReadFileBuffer(pciDir->chars, buffer) && (value = ffStrbufToUInt(buffer, 0)))
-        gpu->frequency = (double) value / (1000 * 1000 * 1000);
-
     if (options->driverSpecific)
     {
         ffStrbufSubstrBefore(pciDir, pciDirLen);