BACKPORT: FROMGIT: f2fs: show the list of donation files

This patch introduces a proc entry to show the currently enrolled donation
files.

- "File path" indicates a file.
- "Status"
 a. "Donated" means the file is registed in the donation list by
    fadvise(offset, length, POSIX_FADV_NOREUSE)
 b. "Evicted" means the donated pages were reclaimed.
- "Offset (kb)" and "Length (kb) show the registered donation range.
- "Cached pages (kb)" shows the amount of cached pages in the inode page cache.

For example,

 # of files  : 2
 File path                                              Status Donation offset (kb)   Donation size (kb)  File cached size (kb)
---
 /local/test2                                          Donated                    0              1048576                2097152
 /local/test                                           Evicted                    0              1048576                1048576

Bug: 437194256
Bug: 442851870
Change-Id: I742fab6fdce42762ec2a13e62690f5e0c3dab849
Link: https://lore.kernel.org/linux-f2fs-devel/8ac33b02-b5ea-4c58-8e60-5411bf0ae62c@kernel.org/T/#t


(cherry picked from commit f1a49c1b
 https: //git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev)
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>