kfdtest: Use GetSystemTickCountInMicroSec() as much as possible

GetSystemTickCountInMicroSec() wraps the function gettimeofday().

Change-Id: I7b767a6efdd1db491fc8113313945b578ac69382
Signed-off-by: Yong Zhao <Yong.Zhao@amd.com>

tests/kfdtest/src/KFDTestUtil.cpp

@@ -24,6 +24,7 @@
 #include "KFDTestUtil.hpp"
 
 #include <stdlib.h>
+#include <sys/time.h>
 #include <algorithm>
 #include <vector>
 #include "BaseQueue.hpp"
@@ -171,6 +172,12 @@ bool isTonga(const HsaNodeProperties *props) {
     return false;
 }
 
+HSAuint64 GetSystemTickCountInMicroSec() {
+    struct timeval t;
+    gettimeofday(&t, 0);
+    return t.tv_sec * 1000000ULL + t.tv_usec;
+}
+
 const HsaMemoryBuffer HsaMemoryBuffer::Null;
 
 HsaMemoryBuffer::HsaMemoryBuffer(HSAuint64 size, unsigned int node, bool zero, bool isLocal, bool isExec,