NFC: port100: Add initiator mode support

This patch implements the initiator NFC operations in_configure_hw()
and in_send_cmd(). It also implements the switch_rf() operation.

The initiator mode supports NFC-A technology at 106kbits/s and NFC-F
technologies at 212 and 424kbits/s.

Signed-off-by: Thierry Escande <[email protected]>
Cc: Stephen Tiedemann <[email protected]>
Tested-by: Cho, Yu-Chen <[email protected]>
Signed-off-by: Samuel Ortiz <[email protected]>