dm vdo: use #define for NO_CHAPTER and NO_CHAPTER_INDEX_ENTRY

Avoids unconventional use of 'static const' and enum in headers.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Matthew Sakai <msakai@redhat.com>

drivers/md/dm-vdo/chapter-index.h

@@ -18,10 +18,8 @@
  * is more efficient. Both types of chapter index are implemented with a delta index.
  */
 
-enum {
-	/* The value returned when no entry is found in the chapter index. */
-	NO_CHAPTER_INDEX_ENTRY = U16_MAX,
-};
+/* The value returned when no entry is found in the chapter index. */
+#define NO_CHAPTER_INDEX_ENTRY U16_MAX
 
 struct open_chapter_index {
 	const struct index_geometry *geometry;

drivers/md/dm-vdo/volume-index.h

@@ -26,7 +26,7 @@
  * managed with volume_index_record structures.
  */
 
-static const u64 NO_CHAPTER = U64_MAX;
+#define NO_CHAPTER U64_MAX
 
 struct volume_index_stats {
 	/* Nanoseconds spent rebalancing */