fs/btrfs: Remove "select SRCU"

Now that the SRCU Kconfig option is unconditionally selected, there is
no longer any point in selecting it.  Therefore, remove the "select SRCU"
Kconfig statements.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Chris Mason <clm@fb.com>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: David Sterba <dsterba@suse.com>
Cc: <linux-btrfs@vger.kernel.org>
Acked-by: David Sterba <dsterba@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: John Ogness <john.ogness@linutronix.de>

fs/btrfs/Kconfig

@@ -17,7 +17,6 @@ config BTRFS_FS
 	select FS_IOMAP
 	select RAID6_PQ
 	select XOR_BLOCKS
-	select SRCU
 	depends on PAGE_SIZE_LESS_THAN_256KB
 
 	help