[XFS] Remove dead flags

SGI Modid: 2.5.x-xfs:slinx:158820a

fs/xfs/pagebuf/page_buf.h

@@ -136,9 +136,6 @@ typedef enum page_buf_flags_e {		/* pb_flags values */
 #define PBF_NOT_DONE(pb) (((pb)->pb_flags & (PBF_PARTIAL|PBF_NONE)) != 0)
 #define PBF_DONE(pb) (((pb)->pb_flags & (PBF_PARTIAL|PBF_NONE)) == 0)
 
-#define PBR_SECTOR_ONLY	1	/* only use sector size buffer heads */
-#define PBR_ALIGNED_ONLY 2	/* only use aligned I/O */
-
 typedef struct pb_target {
 	dev_t			pbr_dev;
 	struct block_device	*pbr_bdev;