UPSTREAM: erofs: avoid on-stack pagepool directly passed by arguments

On-stack pagepool is used so that short-lived temporary pages could be
shared within a single I/O request (e.g. among multiple pclusters).

Moving the remaining frontend-related uses into
z_erofs_decompress_frontend to avoid too many arguments.

Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Yue Hu <huyue2@coolpad.com>
Link: https://lore.kernel.org/r/20230526201459.128169-3-hsiangkao@linux.alibaba.com



Bug: 318378021
(cherry picked from commit 6ab5eed6)
Change-Id: I57d3ba6087904bb40c55b780aca50c16bfba2c0f
Signed-off-by: Sandeep Dhavale <dhavale@google.com>