NFC: digital: Add poll support for type 4A tag platform

This adds support for ATS request and response handling for type 4A tag
activation.

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --cc include/net/nfc/digital.h
Simple merge

diff --cc net/nfc/digital_core.c
Simple merge

diff --cc net/nfc/digital_technology.c
Simple merge