Fix crash for getting offload capability

Load the LE Audio offload capability only if offload is enabled

Bug: 231359883
Tag: #refactor
Test: make build
Change-Id: If4f12f14454cea80c0fb25e2376063ee8a06d9c1
(cherry picked from commit d8042721)
Merged-In: If4f12f14454cea80c0fb25e2376063ee8a06d9c1