NFC: st21nfcb: Move st21nfcb_nci_remove in ndlc_remove

Removing st21nfcb may need to execute some specific commands before
stopping the ndlc state machine.

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