btrfs: zlib: refactor S390x HW acceleration buffer preparation

Currently for s390x HW zlib compression, to get the best performance we
need a buffer size which is larger than a page.

This means we need to copy multiple pages into workspace->buf, then use
that buffer as zlib compression input.

Currently it's hardcoded using page sized folio, and all the handling
are deep inside a loop.

Refactor the code by:

- Introduce a dedicated helper to do the buffer copy
  The new helper will be called copy_data_into_buffer().

- Add extra ASSERT()s
  * Make sure we only go into the function for hardware acceleration
  * Make sure we still get page sized folio

- Prepare for future large folios
  This means we will rely on the folio size, other than PAGE_SIZE to do
  the copy.

- Handle the folio mapping and unmapping inside the helper function
  For S390x hardware acceleration case, it never utilize the @data_in
  pointer, thus we can do folio mapping/unmapping all inside the function.

Acked-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Tested-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>