Look up one more level for common-mk/ directory

We're going to set up the chromeos-dbus-bindings ebuild to
build this source in chromeos with a directory structure like:

platform2/dbus-binding-generator/chromeos-dbus-bindings/

rather than the previous

platform2/chromeos-dbus-bindings/

This requires we modify where we look for common-mk a little.

Change-Id: I87b8d9c3455dcd6227328376d16125a636575d0e
1 file changed
tree: 479f99edd682797e090780c48dd5b8208864bff9
  1. chromeos-dbus-bindings/
  2. MODULE_LICENSE_BSD
  3. NOTICE