meta/lib/oe/recipeutils.py: Handle multi-repo recipes for upgrade check

For a recipe that uses more than one git repo there isn't a single
SRCREV variable. For example for linux-yocto there is SRCREV_machine and
SRCREV_meta and rd.getVar("SRCREV") yields "INVALID".

Luckily bb.fetch2 already handles all the details and exposes the
currently used revision in ud. So just use that.

(From OE-Core rev: ddf00d6aee955878c070327ee8d751fdb6099444)

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/recipeutils.py

@@ -1075,7 +1075,7 @@ def get_recipe_upstream_version(rd):
             try:
                 revision = ud.method.latest_revision(ud, rd, 'default')
                 upversion = pv
-                if revision != rd.getVar("SRCREV"):
+                if revision != ud.revision:
                     upversion = upversion + "-new-commits-available"
             except bb.fetch2.FetchError as e:
                 bb.warn("Unable to obtain latest revision: {}".format(e))