wcnss: set property of wlan.driver.ath to 0

The ability to run shell scripts as a service is removed and thus
only essential functionality from the init.qcom.wifi.sh is set in
wcnss-service. The wlan.driver.ath property needs to be set for
LOWI module to work.

Change-Id: I6ccec41d1fd80fc0cefb7e6feb9528a7a702efbb
CRs-Fixed: 584329
wlan: Use wcnss driver's control interface

Setup the parameters required by wcnss driver thru the control
interface; serial number (for MAC address auto-generation), calibrated
data availability etc. are some of the parameters configured thru this
interface.  These parameters were earlier written thru module parameters,
however that required the wcnss service daemon to have the root permission.

CRs-Fixed: 590457
Change-Id: Ia655ad142c95d542da1ef6b555c13351d6cba5f2
wcnss-service: Preseve old behavior as default

Set TARGET_USES_WCNSS_CTRL := true in Boardconfig to use
the new /dev/wcnss_ctrl and ini in system/etc/wifi

Change-Id: I9912ab03e71c8e0ed4dfd4296e5f12b465ae29d5