xen: Include xen/page.h rather than asm/xen/page.h

Using xen/page.h will be necessary later for using common xen page
helpers.

As xen/page.h already include asm/xen/page.h, always use the later.

Signed-off-by: Julien Grall <[email protected]>
Reviewed-by: David Vrabel <[email protected]>
Cc: Stefano Stabellini <[email protected]>
Cc: Ian Campbell <[email protected]>
Cc: Wei Liu <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Boris Ostrovsky <[email protected]>
Cc: [email protected]
Signed-off-by: David Vrabel <[email protected]>
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 4de46aa..9c6a504 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -44,9 +44,9 @@
 #include <xen/xen.h>
 #include <xen/events.h>
 #include <xen/interface/memory.h>
+#include <xen/page.h>
 
 #include <asm/xen/hypercall.h>
-#include <asm/xen/page.h>
 
 /* Provide an option to disable split event channels at load time as
  * event channels are limited resource. Split event channels are