n1: fix voice recognition for headset

Adding BOARD_USES_SEPERATED_HEADSET_MIC requires now
to have a use case 'Voice Recognition Headset'
Add this as a copy of the use case 'Headset'

Change-Id: I20ec2abd0c5048c838614361f2dec759ccfaee68
Merge "n1: fix voice recognition for headset" into android-4.4