Bluetooth: Audio: CCID - updates for upmerge

Updates to the CCID module for upmerge to Zephyr main

- add bt_ prefix to the ccid_get() function, add explaining comment,
  use defined value for limit
- update copyright statement
- update Kconfig to current practice

Signed-off-by: Asbjørn Sæbø <asbjorn.sabo@nordicsemi.no>
3 files changed