sim: msp430: fix build time warnings

sim: msp430: fix build time warnings

This fix is simple:

msp430-sim.c: In function 'maybe_perform_syscall':
msp430-sim.c:898:10: warning: format '%d' expects argument of type 'int',
                     but argument 5 has type 'long int' [-Wformat]

This one we change to use casts like everyone else does in the code base:

msp430-sim.c: In function 'msp430_step_once':
msp430-sim.c:985:7: warning: passing argument 3 of 'init_disassemble_info'
                    from incompatible pointer type [enabled by default]
include/dis-asm.h:368:13: note: expected 'fprintf_ftype' but argument is
of type 'int (*)(struct FILE * __restrict__,  const char * __restrict__)'