hal: fm: Fix incorrect routing of fm audio to speaker

- FM audio is enabled or disabled through set_parameters() API
  on primary output stream. The audio is routed to device of
  primary output stream.
- If the routing is not updated before the enable command, the
  audio is routed to previous device of primary output.
- Fix the issue by updating the primary output device with device
  from enable command.

Change-Id: I67764b8b5d2cfaddef94ccfe555702289bf36f95
CRs-Fixed: 651821