fs/notify: 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: Jan Kara <jack@suse.cz>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: <linux-fsdevel@vger.kernel.org>
Acked-by: Jan Kara <jack@suse.cz>
Reviewed-by: John Ogness <john.ogness@linutronix.de>

fs/notify/Kconfig

 # SPDX-License-Identifier: GPL-2.0-only
 config FSNOTIFY
 	def_bool n
-	select SRCU
 
 source "fs/notify/dnotify/Kconfig"
 source "fs/notify/inotify/Kconfig"