erofs-utils: keep up with in-kernel ondisk format naming

This patch adapts erofs-utils to the latest kernel ondisk definitions,
especially the following kernel commits:

4b66eb51d2c4 erofs: remove all the byte offset comments
60a49ba8fee1 erofs: on-disk format should have explicitly assigned numbers
b6796abd3cc1 erofs: some macros are much more readable as a function
ed34aa4a8a7d erofs: kill __packed for on-disk structures
c39747f770be erofs: update erofs_inode_is_data_compressed helper
426a930891cf erofs: use feature_incompat rather than requirements
8a76568225de erofs: better naming for erofs inode related stuffs
ea559e7b8451 erofs: update erofs_fs.h comments

Reviewed-by: Li Guifu <blucerlee@gmail.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
7 files changed