NFC: hci: Add load_session HCI operand

load_session allows a CLF to restore the gate <-> pipe table from some
proprietary location.
The main advantage to add this function is to reduce the memory wear by
running pipe creation (and storing) only once.

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