public/version: Change xen_feature_info to have a fixed size

This is technically an ABI change, but Xen doesn't operate in any environment
where "unsigned int" is different to uint32_t, so switch to the explicit form.
This avoids the need to derive (identical) compat logic for handling the
subop.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Julien Grall <jgrall@amazon.com>

xen/include/public/version.h

@@ -50,7 +50,7 @@ typedef struct xen_platform_parameters xen_platform_parameters_t;
 
 #define XENVER_get_features 6
 struct xen_feature_info {
-    unsigned int submap_idx;    /* IN: which 32-bit submap to return */
+    uint32_t     submap_idx;    /* IN: which 32-bit submap to return */
     uint32_t     submap;        /* OUT: 32-bit submap */
 };
 typedef struct xen_feature_info xen_feature_info_t;