block: remove redundant =y from BLK_CGROUP dependency

CONFIG_BLK_CGROUP is a boolean option, that is, its value is 'y' or 'n'.
The comparison to 'y' is redundant.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210927140000.866249-2-masahiroy@kernel.orgSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/Kconfig

@@ -73,7 +73,7 @@ config BLK_DEV_ZONED
 
 config BLK_DEV_THROTTLING
 	bool "Block layer bio throttling support"
-	depends on BLK_CGROUP=y
+	depends on BLK_CGROUP
 	select BLK_CGROUP_RWSTAT
 	help
 	Block layer bio throttling support. It can be used to limit
@@ -112,7 +112,7 @@ config BLK_WBT_MQ
 
 config BLK_CGROUP_IOLATENCY
 	bool "Enable support for latency based cgroup IO protection"
-	depends on BLK_CGROUP=y
+	depends on BLK_CGROUP
 	help
 	Enabling this option enables the .latency interface for IO throttling.
 	The IO controller will attempt to maintain average IO latencies below
@@ -132,7 +132,7 @@ config BLK_CGROUP_FC_APPID
 
 config BLK_CGROUP_IOCOST
 	bool "Enable support for cost model based cgroup IO controller"
-	depends on BLK_CGROUP=y
+	depends on BLK_CGROUP
 	select BLK_RQ_IO_DATA_LEN
 	select BLK_RQ_ALLOC_TIME
 	help