mt76: update to latest version, adds survey support for mt76x2

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/kernel/mt76/Makefile

@@ -10,7 +10,7 @@ PKG_LICENSE_FILES:=
 PKG_SOURCE_URL:=https://github.com/openwrt/mt76
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=11e0a12ce44940be55ed43f5e1638e532520255b
+PKG_SOURCE_VERSION:=3c8a4bc30e363da2250bcd47c54cc36e41736bb9
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.xz
 
 PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>