erofs: move zdata.h into zdata.c

[ Upstream commit a9a94d93 ]

Definitions in zdata.h are only used in zdata.c and for internal
use only.  No logic changes.

Reviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230204093040.97967-4-hsiangkao@linux.alibaba.com


Stable-dep-of: 967c28b2 ("erofs: kill hooked chains to avoid loops on deduplicated compressed images")
Signed-off-by: Sasha Levin <sashal@kernel.org>