Enable voicemngr debug to file by default
This patch is a copy of patchfile https://dev.iopsys.eu/rdk-factory/provider/oem/askey/meta-rdk-askey/-/blob/devel/meta-rdk-iopsys/recipes-telephony/voicemngr/files/0001-Enable-voicemngr-debug-to-file.patch?ref_type=heads which will be removed since we have voicemngr branch for RDK already