[source] linux-firmware: Add mirrors

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/0d4f02dfd650612aac6c11860139be03a0f54bee

commit 0d4f02dfd650612aac6c11860139be03a0f54bee
Author: diizzyy <diizzyy at users.noreply.github.com>
AuthorDate: Fri Sep 23 13:41:41 2016 +0200

    linux-firmware: Add mirrors
    
    Adds Google's mirrors as primary source and kernel.org as fallback.
    Discussed in #lede-dev on Freenode
    
    Signed-off-by: Daniel Engberg <daniel.engberg.lists at pyret.net>
---
 package/firmware/linux-firmware/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/firmware/linux-firmware/Makefile b/package/firmware/linux-firmware/Makefile
index 5656fd6..a1cf30a 100644
--- a/package/firmware/linux-firmware/Makefile
+++ b/package/firmware/linux-firmware/Makefile
@@ -16,7 +16,9 @@ PKG_SOURCE_PROTO:=git
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_SOURCE_VERSION)
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_SOURCE_SUBDIR)
-PKG_SOURCE_URL:=https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
+PKG_SOURCE_URL:=\
+	https://kernel.googlesource.com/pub/scm/linux/kernel/git/firmware/linux-firmware \
+	https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
 PKG_MIRROR_MD5SUM:=762d7f4a87e944338c2871c953603377
 
 PKG_MAINTAINER:=Felix Fietkau <nbd at nbd.name>