mt76: update to the latest version

072fdac mt76x2: mac: consider multicast/broadcast frames in ewma rssi estimation
f450659 mt76x2: improve gain adjustment in noisy environments

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

package/kernel/mt76/Makefile

@@ -8,9 +8,9 @@ PKG_LICENSE_FILES:=
 
 PKG_SOURCE_URL:=https://github.com/openwrt/mt76
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_DATE:=2018-06-15
-PKG_SOURCE_VERSION:=65e161bec8e0fe97d2934982b5d8e29c0f9c8a7e
-PKG_MIRROR_HASH:=321b0b107b811f5d3696cff54c2482af2e406a6aeb908d8edfa9baea9db2105d
+PKG_SOURCE_DATE:=2018-06-18
+PKG_SOURCE_VERSION:=f4506593349608e8a135ba7b465297260a7057f1
+PKG_MIRROR_HASH:=00c8d564b6aed091728eb66f35d356c44cd90467f80666b4f19c9e71bb2fc290
 
 PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
 PKG_BUILD_PARALLEL:=1