NFC: pn544: Separate the core code and the i2c one into different modules

As we may need to support other physical layers, we can avoid linking the
core part into each and every pn544 module.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/pn544/pn544.c

@@ -20,6 +20,7 @@
 
 #include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/module.h>
 
 #include <linux/nfc.h>
 #include <net/nfc/hci.h>
@@ -862,6 +863,7 @@ err_alloc_hdev:
 err_info_alloc:
 	return r;
 }
+EXPORT_SYMBOL(pn544_hci_probe);
 
 void pn544_hci_remove(struct nfc_hci_dev *hdev)
 {
@@ -871,3 +873,7 @@ void pn544_hci_remove(struct nfc_hci_dev *hdev)
 	nfc_hci_free_device(hdev);
 	kfree(info);
 }
+EXPORT_SYMBOL(pn544_hci_remove);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);