LU-13743 build: Explicitly require encryption support

LU-13743 build: Explicitly require encryption support

Linux commit v5.18-rc5-17-gb1241c8eb977
  ext4: move ext4 crypto code to its own file crypto.c

Update the ldiskfs Makefile to exclude crypto.c when
CONFIG_FS_ENCRYPTION is not enabled.

Test-Parameters: trivial
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: Ic8a40f3d395286bb52ed20693fd7cc4755b10556
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/39243
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>