leaudio: Rename subscribe_for_indication

This is a preparation for following patch.
Remove ntf flag from the function and instead of handle and ccc handle
take handle pair.

Bug: 246302994
Test: atest BluetoothInstrumentationTests
Tag: #feature
Merged-In: If30e012dafac523e0381fc7097c07c088efaddd6
Change-Id: If30e012dafac523e0381fc7097c07c088efaddd6
(cherry picked from commit 872d5172)