mt76: update to the latest version

34aed01ca865 mt76: mt7915: use ieee80211_free_txskb to free tx skbs
efc8669db5f9 mt76: mt7915: fix max_mpdu_size field for A-MSDU

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

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:=2020-08-12
-PKG_SOURCE_VERSION:=27670514328f9ec4e64b57ea7cb54d8594dcefa0
-PKG_MIRROR_HASH:=88c1af5529e49dd92ce5b8e992a84f33a8e768ee514df7a7eb31a595070551ae
+PKG_SOURCE_DATE:=2020-08-13
+PKG_SOURCE_VERSION:=efc8669db5f9ff1bf1d7487e0f762ab1bbe8cd85
+PKG_MIRROR_HASH:=2638b63e3b1df743b89806458c910e34472274b7f6ed275f62b475da5dfd649b
 
 PKG_MAINTAINER:=Felix Fietkau <[email protected]>
 PKG_BUILD_PARALLEL:=1