Fix missing combination check SINK/DEVICE

While checking for possible role combinations, the SINK/HOST combination
seems to be mistakenly checked twice intead of SINK/DEVICE.
This CL fixes this. The code now checks for:
1. source & host
2. sink & host
3. source & device
4. sink & device

Bug: 119142682
Change-Id: I5e652fbf9313bd2c122fe728d58e577085632253
Merged-In: I5e652fbf9313bd2c122fe728d58e577085632253