codecs: enable codec2buffer for 64bit only guest

Apparently, codec2buffer works fine with 64bit only
guest, so enable it to unblock further testing
of mediaserver on 64bit only guest.

BUG: 170418402
Test:
lunch sdk_phone64_x86_64
m -j
using camera app to take a video

Change-Id: I41a24f1174531c2fc29ebd8857c04e74aea5af0a