[PATCH] fs: nfsd: fix kconfig dependency warning for NFSD_V4

[Julian Braha]

When NFSD_V4 is enabled and CRYPTO is disabled,
Kbuild gives the following warning:

WARNING: unmet direct dependencies detected for CRYPTO_SHA256
  Depends on [n]: CRYPTO [=n]
  Selected by [y]:
  - NFSD_V4 [=y] && NETWORK_FILESYSTEMS [=y] && NFSD [=y] && PROC_FS [=y]

WARNING: unmet direct dependencies detected for CRYPTO_MD5
  Depends on [n]: CRYPTO [=n]
  Selected by [y]:
  - NFSD_V4 [=y] && NETWORK_FILESYSTEMS [=y] && NFSD [=y] && PROC_FS [=y]

This is because NFSD_V4 selects CRYPTO_MD5 and CRYPTO_SHA256,
without depending on or selecting CRYPTO, despite those config options
being subordinate to CRYPTO.

Signed-off-by: Julian Braha <julianbraha@xxxxxxxxx>
--- a/fs/nfsd/Kconfig 2021-02-09 22:05:29.462030761 -0500
+++ b/fs/nfsd/Kconfig 2021-02-11 12:00:48.974076992 -0500
@@ -73,6 +73,7 @@
   select NFSD_V3
   select FS_POSIX_ACL
   select SUNRPC_GSS
+ select CRYPTO
   select CRYPTO_MD5
   select CRYPTO_SHA256
   select GRACE_PERIOD