net: fill in MODULE_DESCRIPTION()s for NFC

W=1 builds now warn if module is built without a MODULE_DESCRIPTION().
Add descriptions to all NFC Controller Interface (NCI) modules.
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240108181610.2697017-5-leitao@debian.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/nfc/digital_core.c

@@ -858,4 +858,5 @@ void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
 }
 EXPORT_SYMBOL(nfc_digital_unregister_device);
 
+MODULE_DESCRIPTION("NFC Digital protocol stack");
 MODULE_LICENSE("GPL");

net/nfc/nci/core.c

@@ -1577,4 +1577,5 @@ static void nci_cmd_work(struct work_struct *work)
 	}
 }
 
+MODULE_DESCRIPTION("NFC Controller Interface");
 MODULE_LICENSE("GPL");

net/nfc/nci/spi.c

@@ -319,4 +319,5 @@ struct sk_buff *nci_spi_read(struct nci_spi *nspi)
 }
 EXPORT_SYMBOL_GPL(nci_spi_read);
 
+MODULE_DESCRIPTION("NFC Controller Interface (NCI) SPI link layer");
 MODULE_LICENSE("GPL");