BACKPORT: erofs: get rid of erofs_inode_datablocks()

erofs_inode_datablocks() has the only one caller, let's just get
rid of it entirely.  No logic changes.

Bug: 303691233
Change-Id: I15f4e5df8ddd53c570408cc80b255b6934c06fdb

Reviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Change-Id: I96195a960204c313649c510766e6a54d49a01784
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230204093040.97967-1-hsiangkao@linux.alibaba.com


(cherry picked from commit 4efdec36)
Signed-off-by: Sandeep Dhavale <dhavale@google.com>