core-image-core: rename to core-image-x11

Rename to better reflects its purpose, and move under recipes-graphics.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>

diff --git a/meta/recipes-core/images/core-image-core.bb b/meta/recipes-graphics/images/core-image-x11.bb
similarity index 100%
rename from meta/recipes-core/images/core-image-core.bb
rename to meta/recipes-graphics/images/core-image-x11.bb