libkeystore-wifi-hidl: Updated to vendor_available:true

Updated libkeystore-wifi-hidl from 'vendor: true' to 'vendor_available: true'

Test: Build libkeystore-wifi-hidl
Bug: 187130384

Change-Id: Ifba05b57248f52ac33e297acd5d0b7811e3524ee
1 file changed