linux-firmware: update to the latest version, sync with subdir used by the mac80211 package

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

SVN-Revision: 48172

package/firmware/linux-firmware/Makefile

@@ -8,13 +8,14 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=linux-firmware
-PKG_SOURCE_VERSION:=f8c22c692bdee57a20b092e647464ff6176df3ed
-PKG_VERSION:=2014-03-16-$(PKG_SOURCE_VERSION)
+PKG_SOURCE_VERSION:=bbe4917c054eb0a73e250c6363341e3bf6725839
+PKG_VERSION:=2015-12-07-$(PKG_SOURCE_VERSION)
 PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
-PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
+PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_SOURCE_VERSION)
+PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_SOURCE_SUBDIR)
 PKG_SOURCE_URL:=git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
 PKG_MIRROR_MD5SUM:=ca4d289ad9380471cae376fc7dd3660a