dm vdo block-map: rename page state name from "UDS_FREE" to "FREE"

Only used for log message, but no need for "UDS_" prefix.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Susan LeGendre-McGhee <slegendr@redhat.com>
Signed-off-by: Matthew Sakai <msakai@redhat.com>

drivers/md/dm-vdo/block-map.c

@@ -284,7 +284,7 @@ static const char * __must_check get_page_state_name(enum vdo_page_buffer_state
 {
 	int result;
 	static const char * const state_names[] = {
-		"UDS_FREE", "INCOMING", "FAILED", "RESIDENT", "DIRTY", "OUTGOING"
+		"FREE", "INCOMING", "FAILED", "RESIDENT", "DIRTY", "OUTGOING"
 	};
 
 	BUILD_BUG_ON(ARRAY_SIZE(state_names) != PAGE_STATE_COUNT);