Remove service/native/include/Common.h

Move the remaining contents of Common.h to clatutils_test.cpp and remove
Common.h

Bug: 217624062
Test: TH
Change-Id: Ie0615b42a3a1bf4c07e9196128fe0850a448fb35
diff --git a/service/native/libs/libclat/clatutils_test.cpp b/service/native/libs/libclat/clatutils_test.cpp
index f4f97db..cf6492f 100644
--- a/service/native/libs/libclat/clatutils_test.cpp
+++ b/service/native/libs/libclat/clatutils_test.cpp
@@ -26,6 +26,10 @@
 #include "checksum.h"
 }
 
+#include <aidl/android/net/INetd.h>
+#include "clat_mark.h"
+static_assert(aidl::android::net::INetd::CLAT_MARK == CLAT_MARK, "must be 0xDEADC1A7");
+
 // Default translation parameters.
 static const char kIPv4LocalAddr[] = "192.0.0.4";