nvmet: change aen mask functions to use bit numbers

Functions nvmet_aen_disabled and nvmet_clear_aen were using
values not bit numbers ie 1 << 9 not 9 for bit function clear_bit
and test_and_set_bit.

Signed-off-by: Jay Sternberg <jay.e.sternberg@intel.com>
Reviewed-by: Phil Cayton <phil.cayton@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 429c4cf..d6cfa19 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -489,9 +489,15 @@ enum {
 };
 
 enum {
-	NVME_AEN_CFG_NS_ATTR		= 1 << 8,
-	NVME_AEN_CFG_FW_ACT		= 1 << 9,
-	NVME_AEN_CFG_ANA_CHANGE		= 1 << 11,
+	NVME_AEN_BIT_NS_ATTR		= 8,
+	NVME_AEN_BIT_FW_ACT		= 9,
+	NVME_AEN_BIT_ANA_CHANGE		= 11,
+};
+
+enum {
+	NVME_AEN_CFG_NS_ATTR		= 1 << NVME_AEN_BIT_NS_ATTR,
+	NVME_AEN_CFG_FW_ACT		= 1 << NVME_AEN_BIT_FW_ACT,
+	NVME_AEN_CFG_ANA_CHANGE		= 1 << NVME_AEN_BIT_ANA_CHANGE,
 };
 
 struct nvme_lba_range_type {