refactor code for the packet, get rid of packet_impl.hh

and call it packet_access.hh and fix the #includes so
things compile right.

--HG--
extra : convert_revision : d3626c9715b9f7e51bb3ab8d97e971fad4e0b724

src/arch/alpha/isa/main.isa

@@ -73,8 +73,9 @@ output exec {{
 #include "config/ss_compatible_fp.hh"
 #include "cpu/base.hh"
 #include "cpu/exetrace.hh"
+#include "mem/packet.hh"
+#include "mem/packet_access.hh"
 #include "sim/sim_exit.hh"
-#include "mem/packet_impl.hh"
 
 using namespace AlphaISA;
 }};

src/arch/mips/isa/includes.isa

@@ -74,8 +74,9 @@ output exec {{
 #endif
 #include "cpu/base.hh"
 #include "cpu/exetrace.hh"
+#include "mem/packet.hh"
+#include "mem/packet_access.hh"
 #include "sim/sim_exit.hh"
-#include "mem/packet_impl.hh"
 
 using namespace MipsISA;
 }};