fscache: Select netfs stats if fscache stats are enabled

Unconditionally select the stats produced by the netfs lib if fscache stats
are enabled as the former are displayed in the latter's procfile.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Link: https://lore.kernel.org/r/162280352566.3319242.10615341893991206961.stgit@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/162431189627.2908479.9165349423842063755.stgit@warthog.procyon.org.uk/

fs/fscache/Kconfig

@@ -14,6 +14,7 @@ config FSCACHE
 config FSCACHE_STATS
 	bool "Gather statistical information on local caching"
 	depends on FSCACHE && PROC_FS
+	select NETFS_STATS
 	help
 	  This option causes statistical information to be gathered on local
 	  caching and exported through file: