FROMLIST: ext4: wire up FS_IOC_GET_ENCRYPTION_NONCE

This new ioctl retrieves a file's encryption nonce, which is useful for
testing.  See the corresponding fs/crypto/ patch for more details.

Bug: 151100202
Link: https://lore.kernel.org/r/20200314205052.93294-3-ebiggers@kernel.org


Change-Id: I85350aed66285b92444d37c8cd840fb03d2ca25d
Signed-off-by: Eric Biggers <ebiggers@google.com>