migration/multifd: move macros to multifd header

Move MULTIFD_ macros to the header file so that
they are accessible from other source files.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Prasad Pandit <pjp@fedoraproject.org>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-ID: <20250411114534.3370816-2-ppandit@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

migration/multifd.c

@@ -36,11 +36,6 @@
 #include "io/channel-socket.h"
 #include "yank_functions.h"
 
-/* Multiple fd's */
-
-#define MULTIFD_MAGIC 0x11223344U
-#define MULTIFD_VERSION 1
-
 typedef struct {
     uint32_t magic;
     uint32_t version;

migration/multifd.h

@@ -49,6 +49,11 @@ bool multifd_queue_page(RAMBlock *block, ram_addr_t offset);
 bool multifd_recv(void);
 MultiFDRecvData *multifd_get_recv_data(void);
 
+/* Multiple fd's */
+
+#define MULTIFD_MAGIC 0x11223344U
+#define MULTIFD_VERSION 1
+
 /* Multifd Compression flags */
 #define MULTIFD_FLAG_SYNC (1 << 0)