eCryptfs: Remove Kconfig NET dependency and select MD5

eCryptfs no longer uses a netlink interface to communicate with
ecryptfsd, so NET is not a valid dependency anymore.

MD5 is required and must be built for eCryptfs to be of any use.
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>

fs/ecryptfs/Kconfig

 config ECRYPT_FS
 	tristate "eCrypt filesystem layer support (EXPERIMENTAL)"
-	depends on EXPERIMENTAL && KEYS && NET && CRYPTO
+	depends on EXPERIMENTAL && KEYS && CRYPTO
 	select CRYPTO_ECB
 	select CRYPTO_CBC
+	select CRYPTO_MD5
 	help
 	  Encrypted filesystem that operates on the VFS layer.  See
 	  <file:Documentation/filesystems/ecryptfs.txt> to learn more about