Re-enable LTO for libcodec2_hidl_client

The breakage is fixed by aosp/2661935, the workaround is no longer needed.

Test: boot panther
Bug: http://b/170595429
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:7bf3411de0b1651c1033c9c14bbc0a7e7d95b733)
Merged-In: Ia865c9ead60798bd91f2ad89d95b8a310546a665
Change-Id: Ia865c9ead60798bd91f2ad89d95b8a310546a665