Add Macro for Android api level

Author: DannyYuyang-quic

backends/qualcomm/runtime/backends/irbackend/aarch64/QnnDlcManager.cpp

@@ -73,7 +73,12 @@ Error QnnDlcManager::RegisterGraphsFromDLC(
       cache->GetQnnContextBlob();
 
   // memfd_create on android api level 30 and above
-  int fd = memfd_create("tmp.dlc", 0);
+  int fd = -1;
+  #ifdef __ANDROID__
+    #if __ANDROID_API__ >= 30
+      fd = memfd_create("tmp.dlc", 0);
+    #endif
+  #endif
   if (fd == -1) {
     QNN_EXECUTORCH_LOG_ERROR("memfd_create fail");
     return Error::Internal;