NFC: Changed the HCI cmd execution callback prototype

Make it match the data_exchange_cb_t so that it can be used directly in
the implementation of an asynchronous hci_transceive

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --cc net/nfc/hci/command.c
Simple merge

diff --cc net/nfc/hci/core.c
Simple merge

diff --cc net/nfc/hci/hci.h
Simple merge

diff --cc net/nfc/hci/hcp.c
Simple merge