linux-libc-headers-yocto is not directly required in meta, so we can
safely move it to meta-yocto.
Machines including meta-yocto that are using linux-yocto that need headers
which are completely up to date with the linux-yocto git tree can use this
as their preferred linux-libc-headers.
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>