CTS: Added support for VP9 for non-Display frame

i. Adding only unique timestamp to input timastamp list. This is
required as there are duplicate timestamp for non-display frames.
We are matching input timestamp list which has unique entries with
output timestamp list.
ii. Removed checks for InputCount and OutputCount because there are
additional non-display frames. Now video testvectors are not
one-in-one-out. Besides We have checks for input timestamp list which
has unique entries with output timestamplist.

Bug: 143971086

Test: atest android.mediav2.cts.CodecDecoderTest
Test: atest android.mediav2.cts.CodecDecoderSurfaceTest

Change-Id: I261c8039fa430b0197eeb538143c83706084d7b0