Hearing Aid: Use consistent profile support value in framework and app

- This change uses same value for enabling profile support which
  is maintained at frameworks.
- Method to enable Hearing Aid Profile from bt_profile.conf is removed
- Profile feature indexes to be fetched from bt_profile.conf file
  are corrected to have same values across apps and stack.

Change-Id: I649dd80a85dcef97c44fd2e8a65d56794ce9f17e
CRs-Fixed: 2590574
2 files changed