Revert "Build BUILD_MULTI_PREBUILT for the prebuilt target"

This reverts commit 9bfd697cffae4b4f2bdbf122c3bbe7920525e718,
which was causing all prebuilts to be installed in all builds.

Change-Id: Ia5973b31d23bd74ec187b9e44715dea56c063efe
1 file changed