devtool: tag all submodules

In the case of a repository with submodules, we need to add the
"devtool-base" and "devtool-patched" tag on all submodules in order to
properly detect the added/removed/modified patches

(From OE-Core rev: 241da68805d177d4ec4b302c8a997645cc645286)

Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/devtool-source.bbclass

@@ -232,6 +232,9 @@ python devtool_post_patch() {
                 bb.process.run('git rebase devtool-no-overrides', cwd=srcsubdir)
         bb.process.run('git checkout %s' % devbranch, cwd=srcsubdir)
     bb.process.run('git tag -f devtool-patched', cwd=srcsubdir)
+    if os.path.exists(os.path.join(srcsubdir, '.gitmodules')):
+        bb.process.run('git submodule foreach --recursive  "git tag -f devtool-patched"', cwd=srcsubdir)
+
 }
 
 python devtool_post_configure() {