meta-openpower: move bmcweb bbappend

Upstream bmcweb is in recipes-phosphor/interfaces, not
recipes-phosphor/bmcweb.  Move to match.

Change-Id: I341936298d0416fe740f0ce276a871868786dce0
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/recipes-phosphor/bmcweb/bmcweb_%.bbappend b/recipes-phosphor/interfaces/bmcweb_%.bbappend
similarity index 100%
rename from recipes-phosphor/bmcweb/bmcweb_%.bbappend
rename to recipes-phosphor/interfaces/bmcweb_%.bbappend