Make sysbus EHCI devices ARM only by default

A number of ARM embedded boards include EHCI USB host controllers which
appear as directly mapped devices, rather than sitting on a PCI bus.

At present code to emulate such devices is included whenever EHCI support
is included.  This patch adjusts teh config options to only include them
in builds targetting ARM by default.
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

default-configs/arm-softmmu.mak

@@ -33,6 +33,7 @@ CONFIG_PFLASH_CFI01=y
 CONFIG_PFLASH_CFI02=y
 CONFIG_MICRODRIVE=y
 CONFIG_USB_MUSB=y
+CONFIG_USB_EHCI_SYSBUS=y
 
 CONFIG_ARM11MPCORE=y
 CONFIG_A9MPCORE=y

hw/usb/Makefile.objs

@@ -5,7 +5,8 @@ common-obj-y += libhw.o
 # usb host adapters
 common-obj-$(CONFIG_USB_UHCI) += hcd-uhci.o
 common-obj-$(CONFIG_USB_OHCI) += hcd-ohci.o
-common-obj-$(CONFIG_USB_EHCI) += hcd-ehci.o hcd-ehci-pci.o hcd-ehci-sysbus.o
+common-obj-$(CONFIG_USB_EHCI) += hcd-ehci.o hcd-ehci-pci.o
+common-obj-$(CONFIG_USB_EHCI_SYSBUS) += hcd-ehci-sysbus.o
 common-obj-$(CONFIG_USB_XHCI) += hcd-xhci.o
 common-obj-$(CONFIG_USB_MUSB) += hcd-musb.o