Handle exception on setCaptureState

The call to set the capture state is coming from a system server
thread and so failing to handle exception would result in crashing the
system_server process (soft reboot).

Instead, we just log these exceptions on the client side and assume
that the server knows how to recover.

Bug: 171182853
Test: Manual verification that key sound trigger features still
      work.
Change-Id: I97a0b8044f0b6200b4f87fbcf73fca939258b070