ieee802154/adf7242: Add MODULE_FIRMWARE macro

The module loads firmware so add a MODULE_FIRMWARE macro to provide that
information via modinfo.
Signed-off-by: NJuerg Haefliger <juerg.haefliger@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ieee802154/adf7242.c

@@ -1348,3 +1348,5 @@ module_spi_driver(adf7242_driver);
 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 MODULE_DESCRIPTION("ADF7242 IEEE802.15.4 Transceiver Driver");
 MODULE_LICENSE("GPL");
+
+MODULE_FIRMWARE(FIRMWARE);