NFCEEPROM: fix _ndef_buffer_reader init in ctor.

Fixes Coverity issue about not initialized members.

Author: Tharazi97

features/nfc/source/nfc/NFCEEPROM.cpp

@@ -21,7 +21,8 @@ using namespace mbed;
 using namespace mbed::nfc;
 
 NFCEEPROM::NFCEEPROM(NFCEEPROMDriver *driver, events::EventQueue *queue, const Span<uint8_t> &ndef_buffer) : NFCTarget(ndef_buffer),
-    _delegate(NULL), _driver(driver), _event_queue(queue), _initialized(false), _current_op(nfc_eeprom_idle), _ndef_buffer_read_sz(0), _eeprom_address(0), _operation_result(NFC_ERR_UNKNOWN)
+    _delegate(NULL), _driver(driver), _event_queue(queue), _initialized(false), _current_op(nfc_eeprom_idle), _ndef_buffer_read_sz(0), _eeprom_address(0),
+    _operation_result(NFC_ERR_UNKNOWN), _ndef_buffer_reader{nullptr, 0, nullptr}
 {
     _driver->set_delegate(this);
     _driver->set_event_queue(queue);