libhardware do not open system hal for vendor modules

For vendor modules, do not search system directory.
Also, vendor modules do not need to dlopen system hals.

Those are allowed only for system modules.

Bug: 62209000
Test: On the device, use camera, audio and bluetooth a2dp.
Change-Id: If7af82a694ef8de901adae7e9aeb187a30e50b02
1 file changed