xen: fix xen.h build for CONFIG_XEN_PVH=y

For CONFIG_XEN_PVH=y, xen.h uses bool before the type is known. Include
<linux/types.h> earlier.

Signed-off-by: Jani Nikula <[email protected]>
Reviewed-by: Juergen Gross <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Juergen Gross <[email protected]>

include/xen/xen.h

@@ -2,6 +2,8 @@
 #ifndef _XEN_XEN_H
 #define _XEN_XEN_H
 
+#include <linux/types.h>
+
 enum xen_domain_type {
 	XEN_NATIVE,		/* running on bare hardware    */
 	XEN_PV_DOMAIN,		/* running in a PV domain      */
@@ -25,8 +27,6 @@ extern bool xen_pvh;
 #define xen_hvm_domain()	(xen_domain_type == XEN_HVM_DOMAIN)
 #define xen_pvh_domain()	(xen_pvh)
 
-#include <linux/types.h>
-
 extern uint32_t xen_start_flags;
 
 #include <xen/interface/hvm/start_info.h>