mt76: update to the latest version, improves mt7603 stability

cb83f33 mt7603: mac: fix logic in mt7603_tx_hang()
21f20b4 mt7603: mac: fix register configuration in mt7603_rx_dma_busy()
d5e945e mt7603: mcu: fix indentation of mcu command definition

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:=2017-07-17
-PKG_SOURCE_VERSION:=3c4c9a647e4feff3a42ee94d477041fdcf26c463
-PKG_MIRROR_HASH:=7ed7ef6356fafc2525cb6204ca2a3d584c1b83340ef5a1f7c581052f3a1982b1
+PKG_SOURCE_DATE:=2017-09-10
+PKG_SOURCE_VERSION:=d5e945e9b2ee8f52581c1a6978097cf30c39cfd9
+PKG_MIRROR_HASH:=276eb2eea7b5ae64424292c5d955a8543fd3e39a2125b8046a30a519be76f3c9
 
 PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
 PKG_BUILD_PARALLEL:=1