Add wpa_supplicant.conf to the core.mk
Add wpa_supplicant.conf to the core.mk

Note that wpa_supplicant.conf will only be built only if the wpa_supplicant_conf.mk
is included with some conditionals.
Bug: 3003508

Change-Id: I3d1a705c5ff5fd23a8828d5aa756ab2e4edcf4d2

knone1/platform_manifest,xorware/android_build,xorware/android_build,see4ri/lolili,pranav01/platform_manifest,fallouttester/platform_manifest,Hybrid-Power/startsync,ND-3500/platform_manifest,xorware/android_build,xorware/android_build,RR-msm7x30/platform_manifest,xorware/android_build,hagar006/platform_manifest