xen/Makefile: fix dom-y build

We need to add $(dom0-y) to obj-$(CONFIG_XEN_DOM0) after dom0-y is
defined otherwise we end up adding nothing.
Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/xen/Makefile

@@ -8,10 +8,10 @@ obj-y	+= xenbus/
 nostackp := $(call cc-option, -fno-stack-protector)
 CFLAGS_features.o			:= $(nostackp)
 
-obj-$(CONFIG_XEN_DOM0)			+= $(dom0-y)
 dom0-$(CONFIG_PCI) += pci.o
 dom0-$(CONFIG_ACPI) += acpi.o
 dom0-$(CONFIG_X86) += pcpu.o
+obj-$(CONFIG_XEN_DOM0)			+= $(dom0-y)
 obj-$(CONFIG_BLOCK)			+= biomerge.o
 obj-$(CONFIG_XEN_XENCOMM)		+= xencomm.o
 obj-$(CONFIG_XEN_BALLOON)		+= xen-balloon.o