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

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/target-arm/Makefile.objs b/target-arm/Makefile.objs
index 4dcd3c5..f447c4f 100644
--- a/target-arm/Makefile.objs
+++ b/target-arm/Makefile.objs
@@ -1,5 +1,6 @@
 obj-y += arm-semi.o
-obj-y += op_helper.o helper.o cpu.o
+obj-$(CONFIG_SOFTMMU) += machine.o
+obj-y += translate.o op_helper.o helper.o cpu.o
 obj-y += neon_helper.o iwmmxt_helper.o
 
 $(obj)/op_helper.o: QEMU_CFLAGS += $(HELPER_CFLAGS)