[binutils-gdb] sim: move sim-io.h to sim-assert.h

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT 9312936603f4ed0de67aee3d1c4d714df16f995e ***

Author: Mike Frysinger <vapier@gentoo.org>
Branch: master
Commit: 9312936603f4ed0de67aee3d1c4d714df16f995e

sim: move sim-io.h to sim-assert.h
Since sim-endian.c doesn't actually use sim_io funcs, it's weird to
include the sim-io.h header here.  It's doing so only for the assert
header.  So lets relocate the include to the right place.