NFC: mei_phy: adjust mei nfc header according the spec

1. mei_nfc_hci_hdr and mei_nfc_hdr are just the same thing so drop one
2. use mei_nfc_hdr structure as the member of the command and the reply
instead of replicating all header fields.
3. dump the header for easier debugging

Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>