ecryptfs: use filemap_dirty_folio for address space operations

ecryptfs does not use buffer_heads. The legacy block_dirty_folio and
block_invalidate_folio mapping operations were only added as a
temporary compatibility fallback under CONFIG_BLOCK.

Since ecryptfs does not attach private metadata (such as buffer_heads)
to its folios, block_dirty_folio is unnecessary.

Modernize ecryptfs to use filemap_dirty_folio for its dirty_folio
address space operation. This allows removing the block_dirty_folio
and block_invalidate_folio fallbacks, removing the buffer_head header
include, and removing the CONFIG_BLOCK dependency inside ecryptfs_aops.

Signed-off-by: Aditya Prakash Srivastava <aditya.ansh182@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tyler Hicks <code@tyhicks.com>

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