Change LOCAL_SDK_VERSION

launchperf use the private APIs in android.test.runner. So
LOCAL_SDK_VERSION of launchperf will be changed to platform.

Bug: 77577799
Test: m -j

Merged-In: I4ab94e009d96c297b37c7afee35f8ddd2546b977
Change-Id: I4ab94e009d96c297b37c7afee35f8ddd2546b977
(cherry picked from commit 4d09c68a)