CodecEncoderValidationTest: Make all tests optional

All the tests in CodecEncoderValidationTest are now marked optional as
encoders can advertise min and max dimensions/sampling rates etc and
with that, no resolution or sampling rate can be mandated for all codecs
on a device.

Bug: 226206155
Test: atest android.mediav2.cts.CodecEncoderValidationTest
Change-Id: Idd333ced346daf765cc3207ec517263f852b922f
1 file changed