NFC: st-nci: Open NCI_HCI_LINK_MGMT_PIPE

NCI_HCI_LINK_MGMT_PIPE was never opened in st_nci_hci_load_session.

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>