erofs: refactor read_inode calling convention

Refactor out the iop binding behavior out of the erofs_fill_symlink
and move erofs_buf into the erofs_read_inode, so that erofs_fill_inode
can only deal with inode operation bindings and can be decoupled from
metabuf operations. This results in better calling conventions.

Note that after this patch, we do not need erofs_buf and ofs as
parameters any more when calling erofs_read_inode as
all the data operations are now included in itself.

Suggested-by: Al Viro <[email protected]>
Link: https://lore.kernel.org/all/20240425222847.GN2118490@ZenIV/
Signed-off-by: Yiyang Wu <[email protected]>
Reviewed-by: Gao Xiang <[email protected]>
Reviewed-by: Chao Yu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Gao Xiang <[email protected]>

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