Switch to using the tarballs of tagged releases.
WHENCE changed due to firmware filename changes.
(From OE-Core rev: 746438e5e75d9fd4ccb461f92887a7b02a1c27d1)
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>