mt76: add API for testmode support

This can be used for calibration in the manufacturing process.
It supports sending a configurable number of packets with a specific rate
and configurable tx power levels / antenna settings.
It also supports receiving packets and showing some statistics, including
packet counters and detailed RSSI information.
It will only be compiled in if CONFIG_NL80211_TESTMODE is enabled

Signed-off-by: Felix Fietkau <[email protected]>

eeprom.c

@@ -74,6 +74,11 @@ mt76_get_of_eeprom(struct mt76_dev *dev, int len)
 					   &data[i]);
 	}
 
+#ifdef CONFIG_NL80211_TESTMODE
+	dev->test.mtd_name = devm_kstrdup(dev->dev, part, GFP_KERNEL);
+	dev->test.mtd_offset = offset;
+#endif
+
 out_put_node:
 	of_node_put(np);
 	return ret;