device-tree: Make a common-obj

There is no reason for device tree API to be built per-target.
common-obj it. There is an extraneous inclusion of config.h that
needs to be removed.

Cc: Alexander Graf <agraf@suse.de>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

Makefile.objs

@@ -76,6 +76,8 @@ common-obj-$(CONFIG_SECCOMP) += qemu-seccomp.o
 
 common-obj-$(CONFIG_SMARTCARD_NSS) += $(libcacard-y)
 
+common-obj-$(CONFIG_FDT) += device_tree.o
+
 ######################################################################
 # qapi
 

Makefile.target

@@ -129,7 +129,6 @@ ifdef CONFIG_SOFTMMU
 obj-y += arch_init.o cpus.o monitor.o gdbstub.o balloon.o ioport.o numa.o
 obj-y += qtest.o bootdevice.o
 obj-y += hw/
-obj-$(CONFIG_FDT) += device_tree.o
 obj-$(CONFIG_KVM) += kvm-all.o
 obj-y += memory.o savevm.o cputlb.o
 obj-y += memory_mapping.o

device_tree.c

@@ -18,7 +18,6 @@
 #include <unistd.h>
 #include <stdlib.h>
 
-#include "config.h"
 #include "qemu-common.h"
 #include "qemu/error-report.h"
 #include "sysemu/device_tree.h"