Update the logic of determining if a peripheral is input headset or not.

1. Reduce the probability of being input headset if the mic has more
   than 1 channel.
2. Only report a peripheral being a headset if it is also an output
   headset.

Bug: 359667158
Test: connecting USB device and check the reported device type
Flag: EXEMPT bugfix
Change-Id: Ia43ccf95a24f3be703b8c92db801a30ca2f02c45