g3: add libwcnss_qmi override

* override libwcnss_qmi so we can grab the mac out of
  the misc partition for wcnss variants

* must be run as root because system user cannot read
  /dev/block/platform/msm_sdcc.1/by-name/misc

Change-Id: Ib27502240f69e8296721bf01e2dfe4b3fa3a6328