obmc-phosphor-image: move license

Move the LICENSE directive to the image recipe so other recipes could
have their own license, and because this is how oe-core is organized.

Change-Id: I79b472d07efa88ee5bf602f00a3852789bf07e0a
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/recipes-phosphor/images/obmc-phosphor-image.bb b/recipes-phosphor/images/obmc-phosphor-image.bb
index 9c0f87b..a0c14ff 100644
--- a/recipes-phosphor/images/obmc-phosphor-image.bb
+++ b/recipes-phosphor/images/obmc-phosphor-image.bb
@@ -31,6 +31,8 @@
         obmc-settings-mgmt \
         "
 
+LICENSE = "Apache-2.0"
+
 inherit obmc-phosphor-image
 
 # The /etc/version file is misleading and not useful.  Remove it.