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

Conflicts:
	wcnss-service/Android.mk