ia64: fix build (once again)

24423:069c08b7de46 failed to add a necessary include, and for a long
time kexec.h suffered from a missing structure forward declaration.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/ia64/xen/mm.c
+++ b/xen/arch/ia64/xen/mm.c
@@ -180,6 +180,7 @@
 #include <xen/guest_access.h>
 #include <asm/page.h>
 #include <asm/dom_fw_common.h>
+#include <xsm/xsm.h>
 #include <public/memory.h>
 #include <asm/event.h>
 #include <asm/debugger.h>
--- a/xen/include/asm-ia64/kexec.h
+++ b/xen/include/asm-ia64/kexec.h
@@ -4,6 +4,8 @@
 #include <xen/types.h>
 #include <xen/kexec.h>
 
+struct rsvd_region;
+
 extern const unsigned int relocate_new_kernel_size;
 extern void relocate_new_kernel(unsigned long indirection_page,
                                 unsigned long start_address,