block: move ioprio.c from fs/ to block/

Like commit f9c78b2b, move this block related file outside
of fs/ and into the core block directory, block/.

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/Makefile b/block/Makefile
index 506a0c5..b4c4d3b 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -7,7 +7,8 @@
 			blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \
 			blk-iopoll.o blk-lib.o blk-mq.o blk-mq-tag.o \
 			blk-mq-sysfs.o blk-mq-cpu.o blk-mq-cpumap.o ioctl.o \
-			genhd.o scsi_ioctl.o partition-generic.o partitions/
+			genhd.o scsi_ioctl.o partition-generic.o ioprio.o \
+			partitions/
 
 obj-$(CONFIG_BLK_DEV_BSG)	+= bsg.o
 obj-$(CONFIG_BLK_DEV_BSGLIB)	+= bsg-lib.o