erofs: initialize decompression early

 - Rename erofs_init_managed_cache() to z_erofs_init_super();
 - Move the initialization of managed_pslots into z_erofs_init_super() too;
 - Move z_erofs_init_super() and packed inode preparation upwards, before
   the root inode initialization.

Therefore, the root directory can also be compressible.

Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Acked-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20250317054840.3483000-1-hsiangkao@linux.alibaba.com