Add function CleanupOldScratchFiles symmetrically

For symmetry, add function CleanupOldScratchFiles in conditional compilation blocks which missing it.

Test: monkey test for one day and one night

Signed-off-by: Jintao Zhu <zhujtcsieee@gmail.com>

Change-Id: Ie754427334c9a9bb7cfed70df45f439c60c9ab16