kernel: Add missing config option for NFSDv4

This configuration option is not set when building the
layerscape/armv8_64b target.

Fixes: 92aa21497b ("kernel: build support for NFSv4 in nfsd")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/kernel/linux/modules/fs.mk

@@ -443,6 +443,7 @@ define KernelPackage/fs-nfsd
   KCONFIG:= \
 	CONFIG_NFSD \
 	CONFIG_NFSD_V4=y \
+	CONFIG_NFSD_V4_SECURITY_LABEL=n \
 	CONFIG_NFSD_BLOCKLAYOUT=n \
 	CONFIG_NFSD_SCSILAYOUT=n \
 	CONFIG_NFSD_FLEXFILELAYOUT=n \