debugger: increase accessible memory range in the trk adapter

needed after changing the default to "inaccessible"

src/plugins/debugger/gdb/trkgdbadapter.cpp

@@ -1847,7 +1847,7 @@ void TrkGdbAdapter::handleCreateProcess(const TrkResult &result)
     m_engine->postCommand("set displaced-stepping on"); // No difference?
     m_engine->postCommand("set remotelogfile /tmp/gdb-remotelog");
     m_engine->postCommand("set mem inaccessible-by-default");
-    m_engine->postCommand("mem 0x00400000 0x00800000 cache");
+    m_engine->postCommand("mem 0x00400000 0x70000000 cache");
     m_engine->postCommand("mem 0x70000000 0x80000000 cache ro");
     // FIXME: replace with  stack-cache for newer gdb?
     m_engine->postCommand("set remotecache on");  // "info dcache" to check