Remove vehicle binding seed property in emulator

Emulator does not support vehicle binding seed property,
but it reports it supports it. Remove it for now.
Otherwise the vehicle binding utilities will try to set the
vehicle binding seed but that will not be saved anywhere
in the emulator.

Test: manual
Bug: 157501579
Change-Id: I874e94b06fe675a96e5b15c9bff087023b4ea109