LU-16302 llite: Use alloc_inode_sb() to allocate inodes

LU-16302 llite: Use alloc_inode_sb() to allocate inodes

linux-commit: v5.17-49-g8b9f3ac5b01d
  fs: introduce alloc_inode_sb() to allocate filesystems specific
      inode

Filesystems are expected to use alloc_inode_sb to allocate inodes
for proper lru handling.

Test-Parameters: trivial
HPE-bug-id: LUS-11332
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: Ie6f091a01df33738ed2ef6f7fef9c1f9c1a51e03
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49070
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>