In certain contexts it can be useful to find the layer that a file (e.g.
a recipe) appears in.
Implements [YOCTO #7723].
(Bitbake rev: 3bf9c8830c5d5eea5502230d5af84ebd87ad5849)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>