tests/tcg: use regular semihosting for nios2-softmmu

The nios2 code now plugs into the common semihosting code so we can
use the same redirect invocation as the other boards. There is however
a bug raised for the fact the tests don't seem to be completing
properly and silently passing anyway:

  https://gitlab.com/qemu-project/qemu/-/issues/1258

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20221027183637.2772968-9-alex.bennee@linaro.org>

tests/tcg/nios2/Makefile.softmmu-target

@@ -25,8 +25,7 @@ LDFLAGS += -Wl,-T$(LINK_SCRIPT) -static -nostdlib $(CRT_OBJS) -lgcc
 %: %.o $(LINK_SCRIPT) $(CRT_OBJS)
 	$(call quiet-command, $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $< -o $@ $(LDFLAGS), LD, $@)
 
-# FIXME: nios2 semihosting writes to stdout, not a chardev
-QEMU_OPTS = -M 10m50-ghrd,vic=on -semihosting >$@.out -kernel
+QEMU_OPTS = -M 10m50-ghrd,vic=on -semihosting-config enable=on,target=native,chardev=output -kernel
 
 memory: CFLAGS+=-DCHECK_UNALIGNED=0
 TESTS += $(MULTIARCH_TESTS)