arm: fix Dom0 creation after ef72c93df9

ARM Dom0 creation was broken by the said commit because ARM neither
provided XEN_DOMCTL_CDF_hvm_guest nor had CONFIG_PV set.

Set XEN_DOMCTL_CDF_hvm_guest flag for ARM Dom0 to fix the issue. Also
set XEN_DOMCTL_CDF_hap while at it.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Julien Grall <julien.grall@arm.com>

xen/arch/arm/setup.c

@@ -693,6 +693,7 @@ void __init start_xen(unsigned long boot_phys_offset,
     struct bootmodule *xen_bootmodule;
     struct domain *dom0;
     struct xen_domctl_createdomain dom0_cfg = {
+        .flags = XEN_DOMCTL_CDF_hvm_guest | XEN_DOMCTL_CDF_hap,
         .max_evtchn_port = -1,
         .max_grant_frames = gnttab_dom0_frames(),
         .max_maptrack_frames = opt_max_maptrack_frames,