Emulator: set correct rild library path for 64bit arch

BUG: 34861221
Test: build and run sdk_google_phone_x86_64 with emulator
and check radio logcat to make sure it does not complain
about the 32bit library system/lib/libreference-ril.so
being used. Also check the kernel message to make sure
rild is launched properly

Change-Id: I6cbd5abcf64bec9a504066a43fefc55fa698a864