mptcp: use MPTCPOPT_HMAC_LEN macro

Use the macro MPTCPOPT_HMAC_LEN instead of a constant in struct
mptcp_options_received.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>