When the machine-specific BSPs were removed, README.sources was also
removed, but it's still needed for intel-common and intel-quark
releases.
Because we no longer have separate BSP directories for those BSPs,
make it a top-level file in meta-intel.
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
