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/byteswap.hh

@@ -38,7 +38,6 @@
 #define __SIM_BYTE_SWAP_HH__
 
 #include "base/bigint.hh"
-#include "base/misc.hh"
 #include "base/types.hh"
 
 // This lets us figure out what the byte order of the host system is