Update the copyright notice of some of the files I missed

gdb/ChangeLog

gdb/testsuite/gdb.ada/ref_tick_size/p.adb

gdb/testsuite/gdb.ada/ref_tick_size/pck.adb

gdb/testsuite/gdb.ada/ref_tick_size/pck.ads

include/gdb/callback.h

include/gdb/fileio.h

include/gdb/remote-sim.h

include/gdb/signals.h

include/gdb/sim-arm.h

include/gdb/sim-cr16.h

include/gdb/sim-d10v.h

include/gdb/sim-frv.h

include/gdb/sim-h8300.h

include/gdb/sim-m32c.h

include/gdb/sim-ppc.h

include/gdb/sim-sh.h

sim/Makefile.in

sim/arm/Makefile.in

sim/arm/iwmmxt.c

sim/arm/iwmmxt.h