ANDROID: GKI: ufs: add Android ABI padding to some structures

Try to mitigate potential future driver core api changes by adding
padding to struct ufs_hba_variant_ops, struct
ufs_hba_crypto_variant_ops, and struct ufs_hba.

Bug: 151154716
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ib881e531d87eae1f7a5ca312bd36086d62ccaf94