arm/lib/oeqa: fix module lookup

As multiple paths can and do provide modules under oeqa.controllers, all
of these paths need to call pkgutil.extend_path() so the lookup works
correctly.

Signed-off-by: Ross Burton <ross.burton@arm.com>

meta-arm/lib/oeqa/controllers/__init__.py

@@ -0,0 +1,3 @@
+# This is needed so that multiple locations can provide the same package
+from pkgutil import extend_path
+__path__ = extend_path(__path__, __name__)