sim: m32r: move arch-specific settings to internal header

There's no need for these settings to be in sim-main.h which is shared
with common/ sim code, so move it all out to the existing m32r-sim.h.
Unfortunately, we can't yet drop the m32r-sim.h include from sim-main.h
as many of the generated CGEN files refer only to sim-main.h.  We'll
have to improve the CGEN interface before we can make more progress,
but this is at least a minor improvement.

sim/m32r/m32r2.c

@@ -27,6 +27,8 @@
 #include "cgen-mem.h"
 #include "cgen-ops.h"
 
+#include "m32r-sim.h"
+
 /* The contents of BUF are in target byte order.  */
 
 int