style: [patch 3/22] reduce include dependencies in some headers

Used cppclean to help identify useless includes and removed them. This
involved erroneously included headers, but also cases where forward
declarations could have been used rather than a full include.

src/sim/microcode_rom.hh

@@ -36,17 +36,16 @@
  * anything more.
  */
 
-#include "base/misc.hh"
-#include "cpu/static_inst.hh"
+#include <inttypes.h>
+
+#include "cpu/static_inst_fwd.hh"
+
+typedef uint16_t MicroPC;
 
 class MicrocodeRom
 {
   public:
-    StaticInstPtr
-    fetchMicroop(MicroPC micropc, StaticInstPtr curMacroop)
-    {
-        panic("ROM based microcode isn't implemented.\n");
-    }
+    StaticInstPtr fetchMicroop(MicroPC micropc, StaticInstPtr curMacroop);
 };
 
 #endif // __SIM_MICROCODE_ROM_HH__