linux-yocto: introduce 3.8 kernel recipe

linux-yocto: introduce 3.8 kernel recipe

Introducing the linux-yocto 3.8 kernel recipe. The tools and branch structure
of this tree are the same as the previous linux-yocto recipes, while the meta
data and content have been updated for the 3.8 kernel.

build and boot tested for qemu*.

(From OE-Core rev: ecf287a80c5ace2c440f8d0089934d59d25dc3ec)

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>