Turn off LTO for libviabratorservice as a workaround

Previous CL, aosp/2176365, turned off the wrong target by mistake. This
corrects the error.

Bug: 241699694
Test: GLOBAL_THINLTO=true m libvibratorservice_test
Change-Id: I758f84ef28b3e166d87557aee855767d0cd1a4a3