ecryptfs: Convert ecryptfs_copy_up_encrypted_with_header() to take a folio

Both callers have a folio, so pass it in and use it throughout.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20241025190822.1319162-4-willy@infradead.org


Reviewed-by: Pankaj Raghav <p.raghav@samsung.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>