xen: change names and type qualifiers in copy_domain_page() declaration

Change names and type qualifiers of parameters in copy_domain_page()
declaration to keep consistency with the corresponding definition.
This addresses violations of MISRA C:2012 Rule 8.3: "All declarations
of an object or function shall use the same names and type qualifiers".

No functional changes.

Signed-off-by: Federico Serafini <federico.serafini@bugseng.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/include/xen/domain_page.h

@@ -15,7 +15,7 @@
  * Clear a given page frame, or copy between two of them.
  */
 void clear_domain_page(mfn_t mfn);
-void copy_domain_page(mfn_t dst, const mfn_t src);
+void copy_domain_page(mfn_t dest, mfn_t source);
 
 #ifdef CONFIG_ARCH_MAP_DOMAIN_PAGE