build: move other target-*/ objects to nested Makefile.objs

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/target-sh4/Makefile.objs b/target-sh4/Makefile.objs
index 8e9be60..2e0e093 100644
--- a/target-sh4/Makefile.objs
+++ b/target-sh4/Makefile.objs
@@ -1,3 +1,4 @@
-obj-y += op_helper.o helper.o cpu.o
+obj-y += translate.o op_helper.o helper.o cpu.o
+obj-$(CONFIG_SOFTMMU) += machine.o
 
 $(obj)/op_helper.o: QEMU_CFLAGS += $(HELPER_CFLAGS)