Update SUMMARY.md

SUMMARY.md

@@ -14,6 +14,8 @@
     * [Continue architecture-specific boot-time initializations]()
 * [Memory management](mm/README.md)
     * [Memblock](mm/linux-mm-1.md)
+    * [Fixmaps]()
+    * [ioremap]()
 * [Concepts](Concepts/README.md)
     * [Per-CPU variables](Concepts/per-cpu.md)
     * [Cpumasks](Concepts/cpumask.md)