Add interfaces recipe category

Add a new recipe category interfaces for user interface
related recipes.

Move the obmc-rest recipe here.

Change-Id: I940034f64f247643f184bd5cec3005e514ab5cb8
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/common/recipes-phosphor/dbus/obmc-rest.bb b/common/recipes-phosphor/interfaces/obmc-rest.bb
similarity index 100%
rename from common/recipes-phosphor/dbus/obmc-rest.bb
rename to common/recipes-phosphor/interfaces/obmc-rest.bb
diff --git a/common/recipes-phosphor/dbus/obmc-rest/obmc-rest.service b/common/recipes-phosphor/interfaces/obmc-rest/obmc-rest.service
similarity index 100%
rename from common/recipes-phosphor/dbus/obmc-rest/obmc-rest.service
rename to common/recipes-phosphor/interfaces/obmc-rest/obmc-rest.service