Limit CodecEncoderSurfaceTest to default decoder in VNDK before U

In devices with VNDK before U, vendor encoder tests are limited to
testing with default decoder.

Bug: 272255771
Bug: 274582496
Bug: 274581099
Test: atest CtsMediaV2TestCases:CodecEncoderSurfaceTest
(cherry picked from https://android-review.googlesource.com/q/commit:b6b3d626758fa3b647081bc921bdbf1907da1959)
Merged-In: Ief1f3c2d71652bfd518260f0aaf0c7271df7222b
Change-Id: Ief1f3c2d71652bfd518260f0aaf0c7271df7222b