Change VideoDecoderPerfTest semantics for mainline

mainline updates means software codecs evolve. Adapt criteria so that,
after mainline updates, we only test the lower limit. This allows
updated software codecs to run faster.

Bug: 226524584
Test: atest VideoDecoderPerfTest on base and updated systems
Merged-In: I5d98633d394a405666f6ff4188b22859547dd70e
Change-Id: I05ea45f4cc54c5be253d2363f3b782cdcce5f9cb
(cherry picked from commit a325386990216e3bd1fb8a6a5e55a12ba4809748)
5 files changed