tcp: rstreason: fully support in tcp_rcv_synsent_state_process()

In this function, only updating the map can finish the job for socket
reset reason because the corresponding drop reasons are ready.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Link: https://lore.kernel.org/r/20240510122502.27850-2-kerneljasonxing@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>