Include libdl to the list of shared libraries

The default test application halutil uses libwifi-hal-qcom.a which
uses few of the APIs from libdl library. It expects the shared
library to be included explicitly

Change-Id: I88afba7ce353b665fd1dba6462666b27d7c9eec8
CRs-Fixed: 728747
Reenabling libwifi-hal-qcom

Reverting the earlier commit of disabling libwifi-hal-qcom as
we have integrated the wifihal changes.

Change-Id: Ide3a46b0f0989098344615ec542111fa8c7d032e
CRs-Fixed: 710984
Include libdl to the list of shared libraries

libwifi-hal-qcom uses APIs as part of libdl, hence consider them
accorrdingly

Change-Id: Iffe4516026ef2435511364a94753b2ce2b7ba2d1
CRs-Fixed: 710984