nfs: Make NFS_FSCACHE select NETFS_SUPPORT instead of depending on it

Having the NFS_FSCACHE option depend on the NETFS_SUPPORT options makes
selecting NFS_FSCACHE impossible unless another option that additionally
selects NETFS_SUPPORT is already selected.

As a result, for example, being able to reach and select the NFS_FSCACHE
option requires the CEPH_FS or CIFS option to be selected beforehand, which
obviously doesn't make much sense.

Let's correct this by making the NFS_FSCACHE option actually select the
NETFS_SUPPORT option, instead of depending on it.

Fixes: 915cd30 ("netfs, fscache: Combine fscache with netfs")
Cc: stable@vger.kernel.org
Reported-by: Diederik de Haas <didi.debian@cknow.org>
Signed-off-by: Dragan Simic <dsimic@manjaro.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>

Author: Dragan Simic

fs/nfs/Kconfig

@@ -170,7 +170,8 @@ config ROOT_NFS
 
 config NFS_FSCACHE
 	bool "Provide NFS client caching support"
-	depends on NFS_FS=m && NETFS_SUPPORT || NFS_FS=y && NETFS_SUPPORT=y
+	depends on NFS_FS
+	select NETFS_SUPPORT
 	select FSCACHE
 	help
 	  Say Y here if you want NFS data to be cached locally on disc through