kernel: NFSD: add dependency kmod-crypto-arc4 for kmod-fs-nfs-common-rpcsec

crypto-arc4 move into a module with commit c3a78955f3,
fs-nfs-common-rpcsec compile error without arc4 support.

Ref: https://github.com/openwrt/packages/issues/9912

Fixes: c3a78955f3 ("kernel: move crypto-arc4 into a module")
Signed-off-by: Ruixi Zhou <zhouruixi@gmail.com>

package/kernel/linux/modules/fs.mk

@@ -389,7 +389,8 @@ define KernelPackage/fs-nfs-common-rpcsec
 	+kmod-crypto-md5 \
 	+kmod-crypto-sha1 \
 	+kmod-crypto-hmac \
-	+kmod-crypto-ecb
+	+kmod-crypto-ecb \
+	+kmod-crypto-arc4
   KCONFIG:= \
 	CONFIG_SUNRPC_GSS \
 	CONFIG_RPCSEC_GSS_KRB5