[PATCH] fix build for MediaTek MT7610U USB wireless dongle

The mt76x0 driver requires the mt76 core driver to actually function.
So add a 'select' to avoid embarrassing 'symbol unknown' errors
when attempting to modprobe it in a module tree that doesn't
include mt76.ko

Signed-off-by: Valdis Kletnieks <redacted>
---
Still need to figure out why it totally fails to see the 5gz band,
it works find on 2.4 but ends up locked at 72mbits/sec. Works
OK otherwise...

diff --git a/drivers/net/wireless/mediatek/mt76/Kconfig b/drivers/net/wireless/mediatek/mt76/Kconfig
index 850611ad347a..b6c5f17dca30 100644
--- a/drivers/net/wireless/mediatek/mt76/Kconfig
+++ b/drivers/net/wireless/mediatek/mt76/Kconfig

@@ -11,6 +11,7 @@ config MT76x2_COMMON
 
 config MT76x0U
 	tristate "MediaTek MT76x0U (USB) support"
+	select MT76_CORE
 	depends on MAC80211
 	depends on USB
 	help