mediav2 CTS: Update encoder hdr info test basing on documentation

"hdr10-plus-info" is expected to be present in the formats of output
buffers of only VP9 encoder(s) configured for an HDR10+ profiles.

Bug: 296322084
Bug: 296353048
Test: atest android.mediav2.cts.EncoderHDRInfoTest

Change-Id: Ib472e063624d29e4c2ee55f6e1e5d83abb4bf053
1 file changed