xen: xlate_mmu: add missing header to fix 'W=1' warning

[ Upstream commit 72791ac ]

Add a missing header otherwise compiler warns about missed prototype:

drivers/xen/xlate_mmu.c:183:5: warning: no previous prototype for 'xen_xlate_unmap_gfn_range?' [-Wmissing-prototypes]
  int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
      ^~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Srikanth Boddepalli <[email protected]>
Reviewed-by: Boris Ostrovsky <[email protected]>
Reviewed-by: Joey Pabalinas <[email protected]>
Signed-off-by: Juergen Gross <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

drivers/xen/xlate_mmu.c

@@ -34,6 +34,7 @@
 #include <asm/xen/hypervisor.h>
 
 #include <xen/xen.h>
+#include <xen/xen-ops.h>
 #include <xen/page.h>
 #include <xen/interface/xen.h>
 #include <xen/interface/memory.h>