Vibra: emulator: compile and stage vibrator.goldfish

Following the new vibrator hardware module implementation, the
goldfish vibrator module is no longer integrated in the default
vibrator implementation and therefore needs to be explicitly built
for the emulator.

This patch is related to others in:
 - hardware/libhardware
 - hardware/libhardware_legacy
 - frameworks/base
 - device/generic/goldfish

Change-Id: I844279f5535289f079d412fdc44c5cb3c9c1130c
Signed-off-by: David Wagner <david.wagner@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 94611