kfdtest: Consolidate logic for ASSERT vs EXPECT

ASSERT failures result in immediate termination of the test. EXPECT
returns a failure but continues execution. Reserve ASSERT for required
functionality (node initialization, queue creation, etc) where the rest
of the test cannot run if that call fails. Use EXPECT everywhere else

Change-Id: I1c11326fc3ae22b50fa83b07b3b49af1e1f4e69e

tests/kfdtest/src/PM4Packet.cpp

@@ -254,7 +254,7 @@ void PM4SetShaderRegPacket::InitPacket(unsigned int baseOffset, const unsigned i
      */
     m_pPacketData = reinterpret_cast<PM4SET_SH_REG *>(malloc(m_packetSize));
 
-    ASSERT_NOTNULL(m_pPacketData);
+    EXPECT_NOTNULL(m_pPacketData);
 
     m_packetDataAllocated = true;