mt76: update to the latest version, fixes some tx power issues

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

SVN-Revision: 46741

package/kernel/mt76/Makefile

@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mt76
-PKG_VERSION:=2015-07-29
+PKG_VERSION:=2015-08-28
 PKG_RELEASE=1
 
 PKG_LICENSE:=GPLv2
@@ -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:=b0c1bbb8bce64583c78a95c814ab341e2c58331d
+PKG_SOURCE_VERSION:=b6de6a08e46e1a1087a1fcd41a2ee0590de7c4a0
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.xz
 
 PKG_MAINTAINER:=Felix Fietkau <nbd@openwrt.org>