rxrpc: Remove unused function declarations

rxrpc: Remove unused function declarations

commit 3cec055c5695 ("rxrpc: Don't hold a ref for connection workqueue")
left behind rxrpc_put_client_conn().
And commit 248f219cb8bc ("rxrpc: Rewrite the data and ack handling code")
removed rxrpc_accept_incoming_calls() but left declaration.

Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240731100815.1277894-1-yuehaibing@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>