Fix Sampling freq for xgmi tests (#1888)

Low sampling freq was collecting very less samples causing the tests
validation to fail on some systems.

projects/rocprofiler-systems/tests/rocprof-sys-gpu-connect-tests.cmake

@@ -31,7 +31,7 @@ set(_gpu_connect_environment
     "ROCPROFSYS_AMD_SMI_METRICS=busy,temp,power,xgmi,pcie"
     "ROCPROFSYS_SAMPLING_CPUS=none"
     "ROCPROFSYS_USE_SAMPLING=OFF"
-    "ROCPROFSYS_PROCESS_SAMPLING_FREQ=10"
+    "ROCPROFSYS_PROCESS_SAMPLING_FREQ=50"
     "ROCPROFSYS_CPU_FREQ_ENABLED=OFF"
 )