Xen: drop exports of {set,clear}_foreign_p2m_mapping()

They're only used internally, and the layering violation they contain
(x86) or imply (Arm) of calling HYPERVISOR_grant_table_op() strongly
advise against any (uncontrolled) use from a module. The functions also
never had users except the ones from drivers/xen/grant-table.c forever
since their introduction in 3.15.
Signed-off-by: NJan Beulich <jbeulich@suse.com>
Reviewed-by: NStefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/746a5cd6-1446-eda4-8b23-03c1cac30b8d@suse.comSigned-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>

arch/arm/xen/p2m.c

@@ -130,7 +130,6 @@ int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(set_foreign_p2m_mapping);
 
 int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
 			      struct gnttab_unmap_grant_ref *kunmap_ops,
@@ -145,7 +144,6 @@ int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(clear_foreign_p2m_mapping);
 
 bool __set_phys_to_machine_multi(unsigned long pfn,
 		unsigned long mfn, unsigned long nr_pages)

arch/x86/xen/p2m.c

@@ -776,7 +776,6 @@ int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
 out:
 	return ret;
 }
-EXPORT_SYMBOL_GPL(set_foreign_p2m_mapping);
 
 int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
 			      struct gnttab_unmap_grant_ref *kunmap_ops,
@@ -802,7 +801,6 @@ int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(clear_foreign_p2m_mapping);
 
 #ifdef CONFIG_XEN_DEBUG_FS
 #include <linux/debugfs.h>