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- add conn_init and libwfcu packages
- modify mac address of ini and nv (calibration) file through conn_init service
- change ini and nv files location from /system/etc/firmware/wlan/prima
  to /system/etc/wifi, because we must read and write mac address from persist.
  We use wifi firmware loaded location to /vendor/firmware.
  System partition is read-only, so use some fake links like the followings:
- conn_init operation:
  1. copy /system/etc/wifi/WCNSS_qcom_cfg.ini and WCNSS_qcom_wlan_nv.bin
     to /data/misc/wifi.
  2. read mac address from persist and write to ini and nv.
  3. WCNSS_qcom.cfg.ini and WCNSS_qcom_wlan.vn.bin must be loaded
     in /etc/firmware, /vendor/firmware, or /firmware/image.
  4. To operate 3, we use the fake links between
     /data/misc/wifi and /vendor/firmware/wlan/prima
  5. Now, we can use modified ini and nv files from /vendor/firmware/wlan/prima/

Change-Id: I161385f6883ecf6350bd71ab9f2fc9b2543937c0