LU-16796 ptlrpc: Change struct ptlrpc_reply_state to use kref

LU-16796 ptlrpc: Change struct ptlrpc_reply_state to use kref

This patch changes struct ptlrpc_reply_state to use
kref instead of atomic_t

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I15d4982e709fe420b1fade4108581fbc7669058e
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56364
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>