CCodec: Validate hdr10PlusInfo with the flexCount

It is required to have a valid data count to enable hdr10Plus. To avoid
the error in handling hdr10plus metadata, the patch applies the
validation check on the flexCount of hdr10PlusInfo

Bug: 157868992
Test: android.mediav2.cts.CodecDecoderSurfaceTest
Change-Id: I208ce8edfdb6ce8becf6213480ab68201e009716
1 file changed