mt76: mt7603: report firmware version using ethtool

Print fw_ver and build_date members of struct mt7603_fw_trailer
similarly to what appears in the output of 'dmesg' when the MCU firmware
is loaded.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7603/mcu.c

@@ -252,6 +252,9 @@ running:
 	mt76_clear(dev, MT_SCH_4, BIT(8));
 
 	dev->mcu_running = true;
+	snprintf(dev->mt76.hw->wiphy->fw_version,
+		 sizeof(dev->mt76.hw->wiphy->fw_version),
+		 "%.10s-%.15s", hdr->fw_ver, hdr->build_date);
 	dev_info(dev->mt76.dev, "firmware init done\n");
 
 out: